<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE article  PUBLIC "-//NLM//DTD Journal Publishing DTD v3.0 20080202//EN" "http://dtd.nlm.nih.gov/publishing/3.0/journalpublishing3.dtd"><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" dtd-version="3.0" xml:lang="en" article-type="research article"><front><journal-meta><journal-id journal-id-type="publisher-id">AM</journal-id><journal-title-group><journal-title>Applied Mathematics</journal-title></journal-title-group><issn pub-type="epub">2152-7385</issn><publisher><publisher-name>Scientific Research Publishing</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.4236/am.2013.411A1005</article-id><article-id pub-id-type="publisher-id">AM-38844</article-id><article-categories><subj-group subj-group-type="heading"><subject>Articles</subject></subj-group><subj-group subj-group-type="Discipline-v2"><subject>Physics&amp;Mathematics</subject></subj-group></article-categories><title-group><article-title>
 
 
  Solution of Laplace’s Differential Equation and Fractional Differential Equation of That Type
 
</article-title></title-group><contrib-group><contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>ohru</surname><given-names>Morita</given-names></name><xref ref-type="aff" rid="aff1"><sup>1</sup></xref><xref ref-type="corresp" rid="cor1"><sup>*</sup></xref></contrib><contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Ken-ichi</surname><given-names>Sato</given-names></name><xref ref-type="aff" rid="aff2"><sup>2</sup></xref><xref ref-type="corresp" rid="cor1"><sup>*</sup></xref></contrib></contrib-group><aff id="aff1"><addr-line>Tohoku University, Sendai, Japan</addr-line></aff><aff id="aff2"><addr-line>College of Engineering, Nihon University, Koriyama, Japan</addr-line></aff><author-notes><corresp id="cor1">* E-mail:<email>senmm@jcom.home.ne.jp(OM)</email>;<email>senmm@jcom.home.ne.jp(KS)</email>;</corresp></author-notes><pub-date pub-type="epub"><day>16</day><month>10</month><year>2013</year></pub-date><volume>04</volume><issue>11</issue><fpage>26</fpage><lpage>36</lpage><history><date date-type="received"><day>August</day>	<month>19,</month>	<year>2013</year></date><date date-type="rev-recd"><day>September</day>	<month>19,</month>	<year>2013</year>	</date><date date-type="accepted"><day>September</day>	<month>26,</month>	<year>2013</year></date></history><permissions><copyright-statement>&#169; Copyright  2014 by authors and Scientific Research Publishing Inc. </copyright-statement><copyright-year>2014</copyright-year><license><license-p>This work is licensed under the Creative Commons Attribution International License (CC BY). http://creativecommons.org/licenses/by/4.0/</license-p></license></permissions><abstract><p>
 
 
  In a preceding paper, we discussed the solution of Laplace’s differential equation by using operational calculus in the framework of distribution theory. We there studied the solution of that differential equation with an inhomogeneous term, and also a fractional differential equation of the type of Laplace’s differential equation. We there considered derivatives of a function <inline-formula><inline-graphic xlink:href="dit_e43f170b-2a6b-4d14-a65d-8890cd706f8e.png" xlink:type="simple"/></inline-formula>
   on <inline-formula><inline-graphic xlink:href="dit_c3fa0992-39d2-4da2-aea9-a5140e612ab6.png" xlink:type="simple"/></inline-formula>, when <inline-formula><inline-graphic xlink:href="dit_9a1c6a5d-fd83-4617-8142-6db97e475ec2.png" xlink:type="simple"/></inline-formula> is locally integrable on <inline-formula><inline-graphic xlink:href="dit_99741e6f-b5bb-44d2-aaa5-e88d13d71788.png" xlink:type="simple"/></inline-formula>, and the integral <inline-formula><inline-graphic xlink:href="dit_339bcd8c-75d2-404f-81f8-a69195ff2722.png" xlink:type="simple"/></inline-formula> converges. We now discard the last condition that <inline-formula><inline-graphic xlink:href="dit_f6b6fb63-83fa-471d-b865-5933b5d0359c.png" xlink:type="simple"/></inline-formula> should converge, and discuss the same problem. In Appendices, polynomial form of particular solutions are given for the differential equations studied and Hermite’s differential equation with special inhomogeneous terms.
 
</p></abstract><kwd-group><kwd>Laplace’s Differential Equation; Kummer’s Differential Equation; Fractional Differential Equation; Distribution Theory; Operational Calculus; Inhomogeneous Equation; Polynomial Solution</kwd></kwd-group></article-meta></front><body><sec id="s1"><title>1. Introduction</title><p>Yosida [1,2] discussed the solution of Laplace’s differential equation (DE), which is a linear DE, with coefficients which are linear functions of the variable. The DE which he takes up is</p><disp-formula id="scirp.38844-formula112922"><label>(1.1)</label><graphic position="anchor" xlink:href="5-7401796\888748a4-89f4-4636-8384-599d59b45292.jpg"  xlink:type="simple"/></disp-formula><p>where <img src="5-7401796\2ac6e7e6-30f3-41a1-9daf-9267c7b58c23.jpg" /> and <img src="5-7401796\6beea27d-a643-4a86-a33e-a41af5b35f6e.jpg" /> for <img src="5-7401796\ca94e932-f3fe-4294-a184-50187e6d6274.jpg" /> are constants. His discussion is based on Mikusiński’s operational calculus [<xref ref-type="bibr" rid="scirp.38844-ref3">3</xref>]. Yosida [1,2] gave there only one of the solutions of the DE (1.1).</p><p>In the preceding paper [<xref ref-type="bibr" rid="scirp.38844-ref4">4</xref>], we discussed the solution of an fractional differential equation (fDE) of the type of DE (1.1), that is given by</p><disp-formula id="scirp.38844-formula112923"><label>(1.2)</label><graphic position="anchor" xlink:href="5-7401796\1fe6cf31-fb10-4862-adac-c5a052cd9f1f.jpg"  xlink:type="simple"/></disp-formula><p>for <img src="5-7401796\c113fdde-9be0-408c-b1c6-885bb4a959d6.jpg" /> and<img src="5-7401796\587ecedb-c36d-4e75-8c8d-94347c4422df.jpg" />. Here <img src="5-7401796\95c9d6b6-1b8e-4917-abec-2cbf4ea8fb96.jpg" /> for <img src="5-7401796\fdfb80c9-464f-46fb-9b07-3e328a5278b5.jpg" /> is the Riemann-Liouville fractional derivative (fD) defined in Section 2. We use <img src="5-7401796\a7ce1810-0ab0-4193-a81e-8a38c8b491ed.jpg" /> to denote the set of all real numbers, and<img src="5-7401796\002acacc-ce16-4d65-963e-90fa878ba46d.jpg" />. When <img src="5-7401796\4f335214-b00f-49a8-a217-06f02e8d282a.jpg" /> is equal to an integer<img src="5-7401796\320a2822-95d5-4127-b579-f696980f2659.jpg" />,<img src="5-7401796\45798996-5268-4879-900c-fdaeb4dfa0fa.jpg" />. When</p><p><img src="5-7401796\ee03a95e-24b0-46a7-90f4-4c78369c84b7.jpg" />, (1.2) is the inhomogeneous DE for (1.1). We use <img src="5-7401796\65e5b42c-88a3-4aca-ae6b-de5b6f5e64c2.jpg" /> to denote the set of all integers, and<img src="5-7401796\1430ba52-a071-4208-88ef-b983840c9441.jpg" />, <img src="5-7401796\d331e866-ec1e-4ae6-80f4-09c12e406443.jpg" />and</p><p><img src="5-7401796\9c7dfa95-a927-4fac-88e4-fff69a7ab89d.jpg" />for <img src="5-7401796\4da0e702-4c00-4906-b474-9218a57f36d5.jpg" /> satisfying<img src="5-7401796\1d24c26a-1586-463d-82f5-1337a03defcc.jpg" />.</p><p>We use <img src="5-7401796\39b0f3b0-e178-4595-ae4e-87072e221e27.jpg" /> for<img src="5-7401796\09c3b960-48cc-4cd9-b5c5-9c7525730818.jpg" />, to denote the least integer that is not less than<img src="5-7401796\cec6cc65-035d-4a3f-b062-b16189424382.jpg" />.</p><p>In [<xref ref-type="bibr" rid="scirp.38844-ref4">4</xref>], we adopt operational calculus in the framework of distribution theory developed for the solution of the fDE with constant coefficients in [5,6]. In [<xref ref-type="bibr" rid="scirp.38844-ref4">4</xref>], we give the recipe of obtaining the solution of the inhomogeneous equation as well as the homogeneous one, and we show how the set of two solutions of the homogeneous equation is attained.</p><p>In [<xref ref-type="bibr" rid="scirp.38844-ref4">4</xref>], we adopt the usual definition of the Riemann-Liouville fD, which defines <img src="5-7401796\63830e58-9de2-4b03-83e1-9e893e1c0062.jpg" /> only for such a locally integrable function <img src="5-7401796\92bbb664-cb63-4659-ba93-c16939ad046d.jpg" /> on <img src="5-7401796\64aecfae-3a24-4a7e-8e4d-a9a1be0d9e62.jpg" /> that</p><p><img src="5-7401796\3a3ffa46-3f10-472b-a635-b72b11c0fef3.jpg" />is finite. Practically, we adopt Condition B in</p><p>[<xref ref-type="bibr" rid="scirp.38844-ref4">4</xref>], which is Condition IB <img src="5-7401796\00f241d1-c5d1-4e36-b3e0-3b8b01eb1fd9.jpg" /> and <img src="5-7401796\27cc9166-8d15-4b98-8a6d-d9bf96c02346.jpg" /> are expressed as a linear combination of <img src="5-7401796\08f67a81-e281-4cc2-9d7b-ab3b3708d986.jpg" /> for<img src="5-7401796\d578ecfd-cb08-453e-8af7-13f531ac5eff.jpg" />.</p><p>Here <img src="5-7401796\bb395baa-8f96-40dc-8d55-ed677687c2ae.jpg" /> is Heaviside’s step function, and when <img src="5-7401796\e30e6b60-e816-4d17-ac3c-c1fe39780d75.jpg" /> is defined on<img src="5-7401796\ae9af82f-e54e-4c44-9143-07329845891d.jpg" />, <img src="5-7401796\29b1fc9c-0683-4622-b406-78fbd4bd91c7.jpg" />is assumed to be equal to <img src="5-7401796\af6a1137-7d38-4285-a434-30ca1de5802e.jpg" /> when <img src="5-7401796\e8046e47-daba-4b09-b068-f8b6338e59ea.jpg" /> and to <img src="5-7401796\6cbedfdf-a6ca-4ce8-89a0-3c29528c330d.jpg" /> when<img src="5-7401796\a2a10577-108a-49f1-96fe-e0d4c33e841e.jpg" />. <img src="5-7401796\f858ae5b-7a22-44b9-97bb-1887b2ab9a00.jpg" />is defined by</p><disp-formula id="scirp.38844-formula112924"><label>(1.3)</label><graphic position="anchor" xlink:href="5-7401796\b98bcf3c-563c-4237-aa8a-ad215ecda9f6.jpg"  xlink:type="simple"/></disp-formula><p>for<img src="5-7401796\ae5dd48d-51bf-405e-b7dc-f517afc5f248.jpg" />, where <img src="5-7401796\3efa5520-9f0a-4f9d-8004-607bc915e5a9.jpg" /> is the gamma function.</p><p>In [<xref ref-type="bibr" rid="scirp.38844-ref4">4</xref>], we take up Kummer’s DE as an example, which is</p><disp-formula id="scirp.38844-formula112925"><label>(1.4)</label><graphic position="anchor" xlink:href="5-7401796\bd57d2b3-8719-4ece-92e5-33b27dc11d6d.jpg"  xlink:type="simple"/></disp-formula><p>where <img src="5-7401796\8fab54b8-16e8-4cdd-83dd-440a02fbc50e.jpg" /> are constants. If<img src="5-7401796\a38ae722-8dba-4274-9e48-1bff631f2ef2.jpg" />, one of the solutions given in [7,8] is</p><disp-formula id="scirp.38844-formula112926"><label>(1.5)</label><graphic position="anchor" xlink:href="5-7401796\bbea17f8-270f-4029-a726-1e884a9e3e18.jpg"  xlink:type="simple"/></disp-formula><p>where <img src="5-7401796\9e498138-ad96-4c47-83c6-96125863fed1.jpg" /> for <img src="5-7401796\217b1035-4ce1-4e63-a5bd-cd6b9e4b6162.jpg" /> and<img src="5-7401796\2f059c99-68e3-4ed0-9f78-a6382e4f6abb.jpg" />and<img src="5-7401796\2dcbe444-31d4-40c5-89cb-47e855d16a11.jpg" />. The other solution is</p><disp-formula id="scirp.38844-formula112927"><label>(1.6)</label><graphic position="anchor" xlink:href="5-7401796\91f9fea9-6539-432b-8b51-352b758a91af.jpg"  xlink:type="simple"/></disp-formula><p>In [<xref ref-type="bibr" rid="scirp.38844-ref4">4</xref>], if<img src="5-7401796\2669949e-e6fc-4a02-b777-d7516f92f750.jpg" />, we obtain both of the solutions. But when<img src="5-7401796\9726a978-851f-45d7-b8cd-b2c9b91d3cec.jpg" />, (1.6) does not satisfy Condition IB and we could not get it.</p><p>In a recent review [<xref ref-type="bibr" rid="scirp.38844-ref9">9</xref>], we discussed the analytic continuations of fD, where an analytic continuation of Riemann-Liouville fD, <img src="5-7401796\9ac24b39-ab99-4507-b45f-4bcca81500a7.jpg" />, is such that the fD exists even for such a locally integrable function <img src="5-7401796\1f6e5937-7389-4fa9-aa84-c09cb58bf393.jpg" /> on</p><p><img src="5-7401796\0c73e953-b244-4fc0-b52a-0194d73d3269.jpg" />that <img src="5-7401796\7e327dad-a0cd-401f-b294-5d3014bc9b58.jpg" /> diverges. In the present paper, we adopt this analytic continuation of<img src="5-7401796\5623aaf1-e977-4a12-afcd-ea5675834b12.jpg" />.</p><p>In place of the above Condition IB, we now adopt the following condition.</p><p>Condition A <img src="5-7401796\609b507f-7fea-453c-935e-f253632bf257.jpg" /> and <img src="5-7401796\9844197e-112f-4e0f-ab35-b6a428aa0284.jpg" /> are expressed as a linear combination of <img src="5-7401796\a4159fe2-1572-44e7-8df7-9c0cd886e841.jpg" /> for<img src="5-7401796\90c09798-358c-40c2-abba-3dd3bd206191.jpg" />, where <img src="5-7401796\ea18ed4a-faa7-4391-910f-08c1ba93d2ee.jpg" /> is a set of <img src="5-7401796\ffa77d51-ad41-4f86-ad57-aa3413caf7cd.jpg" /> for some<img src="5-7401796\8d4e0af3-27da-4331-963a-c5fe22a917c2.jpg" />.</p><p>As a consequence, we can now achieve ordinary solutions for (1.2) of<img src="5-7401796\34c5eb20-1aa7-400f-bb0d-1ffb0b2dc2b0.jpg" />. For (1.4), we obtain both solutions (1.5) and (1.6) if<img src="5-7401796\c4dd2f18-87b2-4f59-b49e-bc47676c4458.jpg" />.</p><p>It is the purpose this paper to show how the presentation in [<xref ref-type="bibr" rid="scirp.38844-ref4">4</xref>] should be revised, with the change of definition of fD and the replacement of Condition IB with Condition A.</p><p>In Section 2, we prepare the definition of RiemannLiouville fD and then explain how the function <img src="5-7401796\dbf08ab6-34b0-45cb-ad20-9feaa7f4b1fa.jpg" /> and its fD in (1.2) are converted into the corresponding distribution <img src="5-7401796\6609d15d-cd4b-4b62-9b94-4749beb25b3c.jpg" /> and its fD in distribution theory, and also how <img src="5-7401796\7113b17f-660a-4f99-95a3-ea55b85b3df8.jpg" /> is converted back into<img src="5-7401796\23ce1bfa-b4f2-4690-a638-effa8d6e0606.jpg" />. After these preparation, a recipe is given to be used in solving the fDE (1.2) with the aid of operational culculus in Section 3. In this recipe, the solution is obtained only when</p><p><img src="5-7401796\2a456e8f-65d6-4bbc-ba11-cb6f7aaba68d.jpg" />and<img src="5-7401796\5456c8cd-571c-4148-b2bc-517330cb0bc2.jpg" />. When<img src="5-7401796\6421e448-9fab-4521-bf00-dea69a02734f.jpg" />, <img src="5-7401796\9cd44bb2-64b2-481a-ba20-8828743306b1.jpg" />is also required. An explanation of this fact is given in Appendices C and D of [<xref ref-type="bibr" rid="scirp.38844-ref4">4</xref>]. In Section 4, we apply the recipe to (1.2) where <img src="5-7401796\b360264d-b1f3-4501-b088-0b41e0f8751b.jpg" /> and<img src="5-7401796\6c7a7050-e09f-47ed-9dff-3d100e792238.jpg" />, of which special one is Kummer’s DE. This is an example which Yosida [1,2] takes up. In Section 5, we apply the recipe to the fDE with<img src="5-7401796\9bd2ed3b-9393-4527-8abf-a9244c521890.jpg" />, assuming<img src="5-7401796\01cd46db-2e23-4720-94b2-b69dad083239.jpg" />.</p><p>For the Hermite DE with inhomogeneous term, Levine and Malek [<xref ref-type="bibr" rid="scirp.38844-ref10">10</xref>] showed that there exist particular solutions in the form of polynomial. In Appendices A and C, we show that such a solution exists for the DE and fDE studied in Sections 4 and 5, respectively. In Appendix B, we show how the results presented in [<xref ref-type="bibr" rid="scirp.38844-ref10">10</xref>] are derived from those in Appendix A.</p></sec><sec id="s2"><title>2. Formulas</title><p>We now adopt Condition A. We then express <img src="5-7401796\f3693f5b-3d2d-4012-9627-acbfcf92a466.jpg" /> as follows;</p><disp-formula id="scirp.38844-formula112928"><label>(2.1)</label><graphic position="anchor" xlink:href="5-7401796\3eda40a8-4891-4ec0-977c-d29fa886ba8b.jpg"  xlink:type="simple"/></disp-formula><p>where <img src="5-7401796\55a156e0-b4e2-460a-abb3-8279dd451067.jpg" /> are constants.</p><p>Lemma 1 For<img src="5-7401796\d3ab031f-d210-4d37-88bb-3b6cecbc9c3b.jpg" />,</p><disp-formula id="scirp.38844-formula112929"><label>(2.2)</label><graphic position="anchor" xlink:href="5-7401796\c3c84088-9b39-4bc7-a426-8853aeb506b9.jpg"  xlink:type="simple"/></disp-formula><p>Proof By (1.3), for<img src="5-7401796\702ebe9a-e65e-43b7-9eb4-b0298e72161c.jpg" />, we have</p><p><img src="5-7401796\a6e77be7-3492-4daa-a346-82a0e475b3fe.jpg" />. <img src="5-7401796\d077a68d-e43b-43aa-a6bd-23b0a2e72239.jpg" /></p><sec id="s2_1"><title>2.1. Riemann-Liouville Fractional Integral and Derivative</title><p>Let <img src="5-7401796\5b91efe2-b206-4672-bd4c-087315b6988f.jpg" /> be locally integrable on<img src="5-7401796\f9bcbf9f-5dcd-4d6c-a105-99e0d434b804.jpg" />. We then define the Riemann-Liouville fractional integral, <img src="5-7401796\d35e5ccd-72e4-43af-9525-f6c0d1b59a7d.jpg" />, of order <img src="5-7401796\9e73e1d9-0178-405c-b3d1-0acd80fbfaae.jpg" /> by</p><disp-formula id="scirp.38844-formula112930"><label>(2.3)</label><graphic position="anchor" xlink:href="5-7401796\10195868-290d-4283-b07e-bdd456ebd3e2.jpg"  xlink:type="simple"/></disp-formula><p>We then define the Riemann-Liouville fD, <img src="5-7401796\e352a118-3a6b-4c54-bf7d-bf6af3cc11f3.jpg" />, of order<img src="5-7401796\186e3473-ce6c-462b-ac76-ec24e6c6b8d2.jpg" />, by</p><disp-formula id="scirp.38844-formula112931"><label>(2.4)</label><graphic position="anchor" xlink:href="5-7401796\8319ddc1-c7a6-4902-bfed-c461957af473.jpg"  xlink:type="simple"/></disp-formula><p>if it exists, where<img src="5-7401796\ecbe14fb-3715-4f39-a3c5-508ffa3b3e1c.jpg" />, and <img src="5-7401796\787025a6-5e9a-4dcf-b1a6-e9fdafabc47c.jpg" /> for<img src="5-7401796\27ee5732-5185-4342-8357-8c5726980b6f.jpg" />.</p><p>For<img src="5-7401796\c0145fa9-fd45-494f-b535-b64d58a6bc85.jpg" />, we have</p><disp-formula id="scirp.38844-formula112932"><label>(2.5)</label><graphic position="anchor" xlink:href="5-7401796\83ae46f5-8e85-42c6-a9a9-aa44811cfcd1.jpg"  xlink:type="simple"/></disp-formula><p>If we assume that <img src="5-7401796\377bb2f8-a5e0-4b98-a2d3-3b121ccfc10b.jpg" /> takes a complex value, <img src="5-7401796\44733493-c5b6-4d27-bbd4-e9aabdc4c484.jpg" />by definition (2.3) is analytic function of <img src="5-7401796\c3962003-b6d8-446d-833a-03674da2dc1d.jpg" /> in the domain<img src="5-7401796\48eb3367-73a1-4594-9455-c5e25377b05f.jpg" />, and <img src="5-7401796\aedc6f6e-f38f-4acd-96ce-2a6e72e5480b.jpg" /> defined by (2.4) is its analytic continuation to the whole complex plane. If we assume that <img src="5-7401796\e3d338b4-83d6-40f6-9b3a-76fd7f594ee2.jpg" /> also takes a complex value, <img src="5-7401796\d77cca69-39c6-427a-b524-ddc1f923a6e2.jpg" />defined by (2.4) is an analytic function of <img src="5-7401796\2c84c0db-f4bb-4bed-bbf8-e864ebd032f5.jpg" /> in the domain<img src="5-7401796\a6798c65-318b-44aa-b3c7-6bb84105c25c.jpg" />. The analytic continuation as a function of <img src="5-7401796\8a84ea46-74a7-47f2-8839-7c51e51553e4.jpg" /> was also studied. The argument is naturally concluded that (2.5) should apply for the analytic continuation, even in <img src="5-7401796\8c876485-6e30-4fee-a87f-e74b5e29f0c1.jpg" /> except at the points where<img src="5-7401796\48574c4b-3018-42e9-86d2-6ab13eb3c88d.jpg" />; see [<xref ref-type="bibr" rid="scirp.38844-ref9">9</xref>].</p><p>We now adopt this analytic continuation of <img src="5-7401796\826e5eca-eb94-4663-be6e-a3a994654603.jpg" /> to represent<img src="5-7401796\c6631849-f778-4196-a96e-74eecd0032b8.jpg" />, and hence we accept the following lemma.</p><p>Lemma 2 (2.5) holds for every<img src="5-7401796\0b041b40-7a62-472f-b8e0-deb6c41b1b9d.jpg" />,<img src="5-7401796\56a1f48d-0307-469b-8ec5-fde40ec46e04.jpg" />.</p><p>By (2.1) and (2.5), we have</p><disp-formula id="scirp.38844-formula112933"><label>. (2.6)</label><graphic position="anchor" xlink:href="5-7401796\c0518fc0-0764-4ff2-863d-5c39e393a0ee.jpg"  xlink:type="simple"/></disp-formula><p>For <img src="5-7401796\48b27cbe-66ce-4abc-92aa-4adb83f582b8.jpg" /> defined by (2.1), we note that</p><p><img src="5-7401796\211b911a-4df1-403d-b6a9-4b1b474bfc4b.jpg" /></p><p>is locally integrable on<img src="5-7401796\e2338324-0ae0-452e-bdfe-584636213dc7.jpg" />.</p></sec><sec id="s2_2"><title>2.2. Fractional Integral and Derivative of a Distribution</title><p>We consider distributions belonging to<img src="5-7401796\be3955ec-f519-46b9-8b44-bf40d4f3afef.jpg" />. When a function <img src="5-7401796\86b43350-da9d-4dbf-9fbc-d0bfcaa79ad8.jpg" /> is locally integrable on <img src="5-7401796\d83cee71-e9cc-45fc-9c44-ec47b23014c8.jpg" /> and has a support bounded on the left, it belongs to <img src="5-7401796\d74e172f-03be-40bf-8d4a-966d5a4db0c0.jpg" /> and is called a regular distribution. The distributions in <img src="5-7401796\6821ff30-c630-4bd8-9a5d-ff262f079be8.jpg" /> are called right-sided distributions.</p><p>A compact formal definition of a distribution in <img src="5-7401796\53b9f1a3-efec-4248-ae33-9c3454013d00.jpg" /> and its fractional integral and derivative is given in Appendix A of [<xref ref-type="bibr" rid="scirp.38844-ref4">4</xref>].</p><p>Let <img src="5-7401796\00557913-e9e2-4498-9763-3a09699c62c0.jpg" /> be a regular distribution. Then</p><p><img src="5-7401796\ca2eb695-7d01-48b8-85b6-0b9003bca6fe.jpg" />for <img src="5-7401796\8e2b4cb0-c3c3-42c4-9a40-d0e5d410a8b5.jpg" /> is also a regular distribution, and distribution <img src="5-7401796\21fbb005-1b2b-48d8-95bc-44e23e0ae7b4.jpg" /> is defined by</p><disp-formula id="scirp.38844-formula112934"><label>(2.7)</label><graphic position="anchor" xlink:href="5-7401796\7aea5d47-9c18-4d97-a528-0f17c3f1029d.jpg"  xlink:type="simple"/></disp-formula><p>Let<img src="5-7401796\4aee9dd2-baad-4bee-87f7-1d19bd971c91.jpg" />, and let <img src="5-7401796\7db1c0e4-c010-4ff1-8e38-63119c04f003.jpg" /> be such a regular distribution that <img src="5-7401796\40be59cd-a8a5-4f0c-a5de-6d27675bc3ef.jpg" /> is continuous and differentiable on</p><p><img src="5-7401796\3a286d84-6800-4bd1-b148-6599db0d988c.jpg" />, for every<img src="5-7401796\bf84b143-8ae3-4d77-baec-2c9e185162c3.jpg" />. Then <img src="5-7401796\e7881e47-95a5-4e83-9a01-6b562d123093.jpg" /> is defined by</p><disp-formula id="scirp.38844-formula112935"><label>(2.8)</label><graphic position="anchor" xlink:href="5-7401796\51b943be-b995-414e-ac11-780b7de61e52.jpg"  xlink:type="simple"/></disp-formula><p>Let<img src="5-7401796\cfda5e71-a8da-4efe-9701-c05c562f191e.jpg" />, <img src="5-7401796\e8bab660-8a7c-45f2-9145-80483f069b93.jpg" />, and let</p><p><img src="5-7401796\31dd887a-0b13-4615-bfb9-636d2c031c73.jpg" /></p><p>be continuous and differentiable on <img src="5-7401796\137f4e77-e4d5-4100-9dd5-20711ed95d3b.jpg" /> for every<img src="5-7401796\b7a1fb05-fed3-404e-968a-b3a761ee507a.jpg" />. Then</p><disp-formula id="scirp.38844-formula112936"><label>(2.9)</label><graphic position="anchor" xlink:href="5-7401796\ae4d45e9-0781-4220-9c7c-03b6ee63926f.jpg"  xlink:type="simple"/></disp-formula><p>When <img src="5-7401796\385ff253-7d6e-4caf-896c-09c22cef7230.jpg" /> is a regular distribution, <img src="5-7401796\b64389cc-4363-4a03-b1fe-2d6b71052906.jpg" />is defined for all<img src="5-7401796\2d976463-cf63-448a-b3b2-2900b49c9fe8.jpg" />.</p><p>Lemma 3 For<img src="5-7401796\3b8dbfc6-bcb5-453b-b65b-4d71d0d100ca.jpg" />, the index law:</p><disp-formula id="scirp.38844-formula112937"><label>(2.10)</label><graphic position="anchor" xlink:href="5-7401796\227bd0d0-fa69-4a12-ab4e-487239754f51.jpg"  xlink:type="simple"/></disp-formula><p>is valid for every<img src="5-7401796\ff5e44b1-a7f0-467f-a1db-0bdc47b798dd.jpg" />.</p><p>Dirac’s delta function <img src="5-7401796\50fc8c6e-61c7-406a-8512-4aa939852121.jpg" /> is the distribution defined by<img src="5-7401796\7abac352-84d4-4def-904e-41e03bba1f0f.jpg" />.</p><p>Let <img src="5-7401796\4bf58c63-a93f-4cba-b194-ccdcbcfd3f8b.jpg" /> for <img src="5-7401796\3ef2a786-8357-460c-bbad-66ab9eb9abd9.jpg" /> be defined by</p><disp-formula id="scirp.38844-formula112938"><label>(2.11)</label><graphic position="anchor" xlink:href="5-7401796\b3b8104c-a3f5-49cf-a442-b0fe9e22e1e7.jpg"  xlink:type="simple"/></disp-formula><p>Lemma 4 If<img src="5-7401796\b31b61cc-3b7f-43d3-8214-fd204c5580ec.jpg" />,</p><disp-formula id="scirp.38844-formula112939"><label>(2.12)</label><graphic position="anchor" xlink:href="5-7401796\c60328b7-779b-49ee-b37b-05f22f62b64c.jpg"  xlink:type="simple"/></disp-formula><p>Proof By putting <img src="5-7401796\7ed3adec-17b8-4446-9e65-199fd5446dbf.jpg" /> in (2.7) and using (2.11) and (2.5), we obtain</p><p><img src="5-7401796\c9018ffd-64af-46be-89df-06dd39e1d799.jpg" /></p><p>By operating <img src="5-7401796\84ea5b4b-0534-4261-ae1c-b8390d007f26.jpg" /> to this and using (2.9) and (2.5), we obtain (2.12). <img src="5-7401796\f830485c-8b48-45ec-9cfe-8e39f4b3a5b5.jpg" /></p><p>Corresponding to <img src="5-7401796\205ca2ad-9214-4ec1-b460-5f7c95e0fe93.jpg" /> expressed by (2.1), we define <img src="5-7401796\f3828b91-c250-4620-bcf7-e16d9472759b.jpg" /> by</p><disp-formula id="scirp.38844-formula112940"><label>(2.13)</label><graphic position="anchor" xlink:href="5-7401796\f2d10f37-99e4-424e-b0b1-58fa80cb4384.jpg"  xlink:type="simple"/></disp-formula><p>Then <img src="5-7401796\0bd230da-8c62-452e-8d2e-527ef30ef1d4.jpg" /> and <img src="5-7401796\6d26ac6e-336a-4ac9-b5dd-1e35d0917a73.jpg" /> are expressed as</p><disp-formula id="scirp.38844-formula112941"><label>(2.14)</label><graphic position="anchor" xlink:href="5-7401796\dfc3210e-4e9f-455c-80a6-6a332c61f715.jpg"  xlink:type="simple"/></disp-formula><p>where</p><disp-formula id="scirp.38844-formula112942"><label>(2.15)</label><graphic position="anchor" xlink:href="5-7401796\b461eb6e-2446-44d5-8b88-044714dc82e4.jpg"  xlink:type="simple"/></disp-formula><p>Because of (2.11), we have</p><disp-formula id="scirp.38844-formula112943"><label>(2.16)</label><graphic position="anchor" xlink:href="5-7401796\136c5ae5-6a84-49bf-be51-992b0a1f4a51.jpg"  xlink:type="simple"/></disp-formula><p>Lemma 5 Let<img src="5-7401796\179bf6aa-cdf7-41bf-a977-7076bbb27a3d.jpg" />. Then</p><disp-formula id="scirp.38844-formula112944"><label>(2.17)</label><graphic position="anchor" xlink:href="5-7401796\193a3acb-e9b9-47f1-a58e-c38fa13e3c2c.jpg"  xlink:type="simple"/></disp-formula><disp-formula id="scirp.38844-formula112945"><label>(2.18)</label><graphic position="anchor" xlink:href="5-7401796\45ffafd5-2de3-49d7-ae58-2157ab599f88.jpg"  xlink:type="simple"/></disp-formula><p>The last derivative with respect to <img src="5-7401796\22501b6b-b69b-4471-a613-63578e06f112.jpg" /> is taken regarding <img src="5-7401796\8c7fb2ce-b863-484a-8a31-d2266abd5ce4.jpg" /> as a variable.</p><p>A proof of (2.17) for <img src="5-7401796\0a6f9ade-9caf-4824-8942-f201873645e5.jpg" /> is given in Appendix B of [<xref ref-type="bibr" rid="scirp.38844-ref4">4</xref>].</p><p>Proof When<img src="5-7401796\25bf48f1-9677-4ae7-a6e3-50f8cb831843.jpg" />, <img src="5-7401796\6079d4d6-0020-4457-810c-8421ddf7b37e.jpg" />, by Lemmas 4 and 1,</p><p><img src="5-7401796\62060bc6-0d5a-4012-85a5-bb3bbec82492.jpg" /></p><p>The first equality in (2.18) is obtained from (2.17) and vice versa, by using (2.11). <img src="5-7401796\5c368e8c-9789-440b-8617-744c8d221430.jpg" /></p><p>The following lemma is a consequence of this lemma.</p><p>Lemma 6 Let <img src="5-7401796\729236cf-0918-40e1-ad9d-4ef1f62ff774.jpg" /> be expressed as a linear combination of <img src="5-7401796\aea9778b-13b0-4927-827a-019242dc43cf.jpg" /> for<img src="5-7401796\b324c6c0-0c10-4a24-a987-90c6e8bd41e2.jpg" />. Then</p><disp-formula id="scirp.38844-formula112946"><label>(2.19)</label><graphic position="anchor" xlink:href="5-7401796\ce576a5e-e79b-4592-b32c-22a93319339c.jpg"  xlink:type="simple"/></disp-formula></sec><sec id="s2_3"><title>2.3. From <img src="5-7401796\75085d4e-0bc4-461e-bcc4-ae30df0a8bc0.jpg" /> to <img src="5-7401796\45955314-3da5-4c2e-b702-a4d13ae872cf.jpg" /> and Vice Versa</title><p>Lemma 7 Let<img src="5-7401796\af4fa415-0c71-4e14-9fbf-9828fc9422a4.jpg" />, <img src="5-7401796\57c7d7d3-8113-4815-a081-22f9625e5b66.jpg" />satisfy<img src="5-7401796\460bbb35-12ff-4e34-8a30-a300743dcd43.jpg" />. Then</p><disp-formula id="scirp.38844-formula112947"><label>(2.20)</label><graphic position="anchor" xlink:href="5-7401796\533d992c-081d-4816-b765-e2b68f53b1cc.jpg"  xlink:type="simple"/></disp-formula><disp-formula id="scirp.38844-formula112948"><label>(2.21)</label><graphic position="anchor" xlink:href="5-7401796\c2d1375b-cd7d-40d9-b1dd-b90d1a7a033c.jpg"  xlink:type="simple"/></disp-formula><p>Proof Formula (2.20) is derived by applying (2.3), (2.12) and (2.16) to the righthand. Formula (2.21) follows from (2.20) by replacing <img src="5-7401796\5015287a-74f3-47e1-9d1b-80b4ac6f84f3.jpg" /> and <img src="5-7401796\687eaeda-2c4e-4b26-bef2-a9dab1e969d7.jpg" /> by<img src="5-7401796\b40c34da-a63b-4b7b-81ec-2fa58a24759e.jpg" />, and<img src="5-7401796\c726b4fc-2293-4443-a272-91dd4d674f6b.jpg" />, respectively, by using (2.2) and (2.17). <img src="5-7401796\a1436ed6-8bcb-445f-87a1-63f726d407b7.jpg" /></p><p>By using Lemma 7 to (2.6), we obtain</p><disp-formula id="scirp.38844-formula112949"><label>(2.22)</label><graphic position="anchor" xlink:href="5-7401796\8f3581f3-3c81-4be5-8a0f-f729db82451f.jpg"  xlink:type="simple"/></disp-formula><disp-formula id="scirp.38844-formula112950"><label>(2.23)</label><graphic position="anchor" xlink:href="5-7401796\d8544b62-c9c4-47c5-a313-5e371745cce3.jpg"  xlink:type="simple"/></disp-formula><p>Lemma 8 Let<img src="5-7401796\1e16a4e2-c54b-4102-afaf-50e1c6a23733.jpg" />, <img src="5-7401796\aea70181-3f36-4bb0-aeeb-4a256b557d40.jpg" />satisfy<img src="5-7401796\9a4a2b81-08ec-4823-8d4f-c4ba7c30fa3d.jpg" />. Then</p><disp-formula id="scirp.38844-formula112951"><label>(2.24)</label><graphic position="anchor" xlink:href="5-7401796\e8dda486-7525-4862-9ab5-2ff5762f7320.jpg"  xlink:type="simple"/></disp-formula><p>This follows from (2.20).</p><p>Condition B <img src="5-7401796\e2696ae0-404a-41e5-96a8-40c99a6d81a7.jpg" /> is expressed as a linear combination of <img src="5-7401796\09a220f4-2fd3-4084-a035-0f17816e272c.jpg" /> for<img src="5-7401796\6bdf4072-90f9-4a26-ae45-f07f7f724df7.jpg" />, where <img src="5-7401796\f7883cd4-aa7c-4b1c-b707-179adada6b03.jpg" /> is a set of<img src="5-7401796\f7ec307e-130f-4a4d-a0bd-f1df9e59058c.jpg" />, for some<img src="5-7401796\73e86d99-96ae-4bc1-a8a9-c48e8c6ad7c5.jpg" />.</p><p>When this condition is satisfied, <img src="5-7401796\63cd74e3-9424-468e-80eb-9d2a993d96a3.jpg" />is expressed as (2.13) with <img src="5-7401796\ebe43b33-7782-485c-b7fe-830450a4ad20.jpg" /> replaced by<img src="5-7401796\a7718549-e640-4cfe-a4ba-ca1afb7de917.jpg" />.</p><p>Lemma 9 Let <img src="5-7401796\e6579985-0518-4ddb-97e3-701b2187d69e.jpg" /> satisfy Condition B. Then the corresponding <img src="5-7401796\66c1ad9b-353c-40d7-887b-e43ee02dbb4e.jpg" /> is obtained from<img src="5-7401796\3ef322da-b703-41e9-a8d1-0744fa0fed12.jpg" />, by</p><disp-formula id="scirp.38844-formula112952"><label>(2.25)</label><graphic position="anchor" xlink:href="5-7401796\66b9777b-de0f-443d-965b-4e928ffc37f9.jpg"  xlink:type="simple"/></disp-formula><p>and is expressed by (2.1) with <img src="5-7401796\0917ec24-3583-419b-ae34-86d2a3987022.jpg" /> replaced by<img src="5-7401796\6bdb526f-0ba9-455a-8280-2162e71dae99.jpg" />.</p><p>Lemma 10 Let <img src="5-7401796\5b59de61-04d0-4db6-8516-950cde3b0aa0.jpg" /> and <img src="5-7401796\21eaf9e4-2b78-4245-9aa5-22aa3a195504.jpg" /> be given by (2.13) and (2.1), respectively. Then <img src="5-7401796\335ec072-f887-4789-affe-9a4f7df95f04.jpg" /> and <img src="5-7401796\eb39486c-4a7a-4dd0-9ed4-c461f22579d8.jpg" /> are related by</p><disp-formula id="scirp.38844-formula112953"><label>(2.26)</label><graphic position="anchor" xlink:href="5-7401796\4229981a-bae4-4992-b752-c1c23ea06d9b.jpg"  xlink:type="simple"/></disp-formula><disp-formula id="scirp.38844-formula112954"><label>(2.27)</label><graphic position="anchor" xlink:href="5-7401796\e42f2d08-e582-4f17-a42e-5814169e48e8.jpg"  xlink:type="simple"/></disp-formula><p>if <img src="5-7401796\46151c6a-026a-4338-b14a-b0fb6aae9319.jpg" /> satisfies<img src="5-7401796\3563ed55-4354-4736-8feb-3a61edd8955d.jpg" />.</p><p>Proof By (2.13) and (2.16), we have</p><disp-formula id="scirp.38844-formula112955"><label>(2.28)</label><graphic position="anchor" xlink:href="5-7401796\885d58de-ff2d-4434-bfd2-9e36ad8f5860.jpg"  xlink:type="simple"/></disp-formula><p>Using (2.22) in the first term on the righthand side, we obtain (2.26). Multiplying (2.28) by <img src="5-7401796\8353e37a-c600-46c6-9524-edc68fceaf6c.jpg" /> and noting that the first term on the righthand side is then equal to (2.23), we obtain (2.27). <img src="5-7401796\b42db5cc-af3b-4399-936c-49913f62cfe6.jpg" /></p></sec></sec><sec id="s3"><title>3. Recipe of Solving Laplace’s DE and fDE of That Type</title><p>We now express the DE/fDE (1.2) to be solved, as follows:</p><disp-formula id="scirp.38844-formula112956"><label>(3.1)</label><graphic position="anchor" xlink:href="5-7401796\68fe02ca-98bc-4439-a2fd-70a50977d62a.jpg"  xlink:type="simple"/></disp-formula><p>where <img src="5-7401796\30a933a9-0b3b-4e47-aca9-de95336a63a5.jpg" /> or<img src="5-7401796\b6e9f324-7fb7-41f0-9913-ae21e8d74345.jpg" />, and<img src="5-7401796\04aebab9-b9ef-46a5-aab4-1e7ffe6aa759.jpg" />. In Sections 4 and 5, we study this DE for <img src="5-7401796\e3a319b7-2c1b-4669-941a-688339ca136b.jpg" /> and this fDE for<img src="5-7401796\7a8ad0d4-71b6-43c5-8930-f3280aa3b45f.jpg" />, respectively.</p><sec id="s3_1"><title>3.1. Deform to DE/fDE for Distribution</title><p>Using Lemma 10, we express (3.1) as</p><disp-formula id="scirp.38844-formula112957"><label>(3.2)</label><graphic position="anchor" xlink:href="5-7401796\9288d7da-39e3-40d6-ba24-c927ebca8577.jpg"  xlink:type="simple"/></disp-formula><p>where</p><disp-formula id="scirp.38844-formula112958"><label>(3.3)</label><graphic position="anchor" xlink:href="5-7401796\41a7def8-9b21-4da0-b910-b0d916227f30.jpg"  xlink:type="simple"/></disp-formula></sec><sec id="s3_2"><title>3.2. Solution Via Operational Calculus</title><p>By using (2.14) and (2.19), we express (3.2) as</p><disp-formula id="scirp.38844-formula112959"><label>(3.4)</label><graphic position="anchor" xlink:href="5-7401796\cd9cdfff-c746-48c5-8563-7ce1ffc0d715.jpg"  xlink:type="simple"/></disp-formula><p>where</p><disp-formula id="scirp.38844-formula112960"><label>(3.5)</label><graphic position="anchor" xlink:href="5-7401796\6dea6793-0124-4a94-9cd7-b28b4f8d5cf4.jpg"  xlink:type="simple"/></disp-formula><disp-formula id="scirp.38844-formula112961"><label>(3.6)</label><graphic position="anchor" xlink:href="5-7401796\21e97def-4a15-46c4-9a8f-c46121ada94c.jpg"  xlink:type="simple"/></disp-formula><p>In order to solve the Equation (3.4) for</p><p><img src="5-7401796\7f14ceb4-3a9f-42b8-91c0-e07173d2c858.jpg" />we solve the following equation for function <img src="5-7401796\bae41159-eaad-40b0-9d26-e0ed65db5c05.jpg" /> of real variable<img src="5-7401796\f15dd153-8c66-4710-9853-9a099a56513a.jpg" />:</p><disp-formula id="scirp.38844-formula112962"><label>(3.7)</label><graphic position="anchor" xlink:href="5-7401796\d957da8e-7bcd-442f-9ea2-71b18c2f5625.jpg"  xlink:type="simple"/></disp-formula><p>Lemma 11 The complementary solution (C-solution) of equation (3.7) is given by<img src="5-7401796\39634029-cbf0-4be9-988b-e808c52fb631.jpg" />, where <img src="5-7401796\d762df31-e72f-44c2-a2de-f8090eaf9284.jpg" /> is an arbitrary constant and</p><disp-formula id="scirp.38844-formula112963"><label>(3.8)</label><graphic position="anchor" xlink:href="5-7401796\cc6fb126-b0f2-4100-ba36-f221cae5cbaa.jpg"  xlink:type="simple"/></disp-formula><p>where the integral is the indefinite integral and <img src="5-7401796\84cc84b4-df77-4526-8a8d-93c21fc69f39.jpg" /> is any constant.</p><p>Lemma 12 Let <img src="5-7401796\8612642e-ba99-44f0-a00a-00c54e62b8d5.jpg" /> be the C-solution of (3.7), and <img src="5-7401796\d6d431dc-c722-4196-8388-b4327f0e0d39.jpg" /> be the particular solution (P-solution) of (3.7), when the inhomogeneous term is <img src="5-7401796\cbc45e21-5768-4f94-a5ff-24c015e27c54.jpg" /> for<img src="5-7401796\c096828e-7d7a-4a5f-979c-bf1c4f2d8eaa.jpg" />. Then</p><disp-formula id="scirp.38844-formula112964"><label>(3.9)</label><graphic position="anchor" xlink:href="5-7401796\3e55c581-8d00-4788-816d-aecde7cd30f0.jpg"  xlink:type="simple"/></disp-formula><p>where <img src="5-7401796\84fe4f5d-fb57-4146-b964-2b0e5473b3c3.jpg" /> is any constant.</p><p>Since <img src="5-7401796\dd589267-2ba9-44a0-a718-f18fcc109742.jpg" /> satisfies Condition A and <img src="5-7401796\18bb9934-e55b-46bf-bbbf-9cc38c61dea8.jpg" /> is given by (3.6), the P-solution <img src="5-7401796\fab5996e-0198-4515-a257-08fefd48d366.jpg" /> of (3.7) is expressed as a linear combination of <img src="5-7401796\31b3f36d-c481-48bf-a99a-f4b1916287b0.jpg" /> for<img src="5-7401796\f206769f-a52b-4894-85e3-e1301efa1eb6.jpg" />, and of <img src="5-7401796\4fad60cd-c63b-4f5d-b7b0-4c2f61bb8c2e.jpg" /> for<img src="5-7401796\3dc5ad12-8059-4c43-b622-0f2d372f276b.jpg" />, respectively.</p><p>From the solution <img src="5-7401796\660fb967-09aa-4097-97ff-c795951584ce.jpg" /> of (3.7), <img src="5-7401796\e3257c20-2dc4-493b-840c-aed7abd1ae39.jpg" />is obtained by substituting <img src="5-7401796\7065df6f-1749-4d58-870f-90cdc51dd7ca.jpg" /> by<img src="5-7401796\caaac8d1-a2b8-4011-adcb-a7b6adb44384.jpg" />. Then we confirm that (3.4) is satisfied by that <img src="5-7401796\f6cb8dab-a6e4-44ec-a57f-cbcf1c789e2f.jpg" /> operated to<img src="5-7401796\8667279d-226b-4e7c-97cd-d7f4eb79dc25.jpg" />.</p></sec><sec id="s3_3"><title>3.3. Neumann Series Expansion</title><p>Finally the obtained expression of <img src="5-7401796\1a6b7028-0fc6-442e-8ffe-c52ff306a0a1.jpg" /> is expanded into Neumann series [<xref ref-type="bibr" rid="scirp.38844-ref11">11</xref>]. Practically we expand it into the sum of terms of negative powers of D, and then we obtain the solution <img src="5-7401796\7d076f43-92cd-4d1d-b2af-a8de9e15670e.jpg" /> of (3.4). If the obtained <img src="5-7401796\2dafe110-3af4-4c29-80b7-d9ddfa68c013.jpg" /> is a linear combination of <img src="5-7401796\2f6cfe27-c61e-4bbb-8686-6f4a9b7a0649.jpg" /> for <img src="5-7401796\3fe816b1-e1eb-4865-b49f-b0031b3b1030.jpg" /> with some<img src="5-7401796\41c78369-1b32-440b-a21e-d20b3b4e2db7.jpg" />, then <img src="5-7401796\7b60eaea-2573-45e8-9def-10d135205b4e.jpg" /> is the solution <img src="5-7401796\ab54d715-b0b9-4ab6-807b-8a6408b6ad40.jpg" /> of (3.2). If it satisfies Condition B, it is converted to a solution <img src="5-7401796\1738f81b-49c9-4644-8200-c303af72b046.jpg" /> of (3.1) for<img src="5-7401796\6d4fcf3d-84ff-430d-82c8-e6665acab1fc.jpg" />, with the aid of Lemma 9.</p></sec><sec id="s3_4"><title>3.4. Recipe of Obtaining the Solution of (3.1)</title><p>1) We prepare the data: <img src="5-7401796\f5da0007-8b62-43b1-b1f5-66bcc7207ab4.jpg" />by (2.14), and<img src="5-7401796\80d699c1-199a-46fc-b213-f0002e3ed28e.jpg" />, <img src="5-7401796\976cbc6b-0ed5-4bd7-978c-ee235a72d298.jpg" />and <img src="5-7401796\4d0b9942-2fa0-4895-8a3a-afe06a6af84e.jpg" /> by (3.5) and (3.6).</p><p>2) We obtain <img src="5-7401796\62d64f42-0d0f-49b7-95af-2c708d15ade9.jpg" /> by (3.8). The C-solution of (3.2) is given by</p><p><img src="5-7401796\7ec74ebd-ea72-4516-8f36-d0173bf4e284.jpg" /></p><p>If<img src="5-7401796\9e137132-2660-4b5e-981b-cf7d5b440888.jpg" />, the C-solution of (3.1) is obtained from this with the aid of Lemma 9.</p><p>3) If <img src="5-7401796\b3380441-b342-4b42-ba73-14ba8bbc6c29.jpg" /> or<img src="5-7401796\b0997345-1992-4be9-b6ea-ec090b440d8d.jpg" />, we obtain <img src="5-7401796\5cc58c09-c031-40c4-a0eb-be1e1902b2ce.jpg" /> given by (3.9).</p><p>4) If <img src="5-7401796\e775101d-26cd-47c6-aeed-860059554cf4.jpg" /> and<img src="5-7401796\753faf38-235b-425f-8a25-83e74eecc79d.jpg" />, the solution of (3.2) is given by</p><disp-formula id="scirp.38844-formula112965"><label>(3.10)</label><graphic position="anchor" xlink:href="5-7401796\8307e7c2-d0cb-4e4c-aa91-c1cd39ec9e21.jpg"  xlink:type="simple"/></disp-formula><p>where <img src="5-7401796\74a86062-fe41-40ff-893e-0303ea6f8b82.jpg" /> are constants. The C-solution of (3.1) is then obtained from this with the aid of Lemma 9.</p><p>5) If<img src="5-7401796\499a5e6c-6ff3-430b-b0ef-d7778983fdd3.jpg" />, the P-solution of (3.2)</p><p>is given by</p><p><img src="5-7401796\6ff28700-b843-437f-bea6-b1dc13774ca8.jpg" /></p><p>where <img src="5-7401796\a1f1934a-ac98-4ca2-93f7-5117aabbdcef.jpg" /> and <img src="5-7401796\8ddcea4d-3ec9-415d-b864-f4a014a50c15.jpg" /> are constants. The P-solution of (3.1) with inhomogeneous term</p><p><img src="5-7401796\03f1dd3c-a4d7-4037-9213-759ed321ebdb.jpg" /></p><p>is obtained from this with the aid of Lemma 9.</p></sec><sec id="s3_5"><title>3.5. Comments on the Recipe</title><p>In the above recipe, we first obtain the C-solution of (3.7), that is<img src="5-7401796\ee80b8f5-ce70-486e-9c4c-aa4571a4d2ed.jpg" />. It gives the C-solution <img src="5-7401796\bb3f70b2-8b48-4aa1-a7db-9533e9660b06.jpg" /> of (3.4) and hence the C-solutions <img src="5-7401796\72e67dee-4a82-45a1-9263-58d74b3246eb.jpg" /> of (3.2). A C-solution <img src="5-7401796\d4b01da5-281f-481e-b330-5e94c2264112.jpg" /> of (3.1) is then obtained with the aid of Lemma 9.</p><p>We next obtain the P-solution <img src="5-7401796\99f4b3d7-2d7f-49f4-9d31-3a35fa8d775e.jpg" /> of (3.7), when the inhomogeneous part is <img src="5-7401796\68e64e7e-468b-4f42-9612-6f81b3115636.jpg" /> for<img src="5-7401796\5d9b78f0-a930-47e7-af13-c37802f030fc.jpg" />. As noted above, the P-solutions <img src="5-7401796\3ee303d2-01ea-4e68-a411-d0d437ff0514.jpg" /> of (3.7) for <img src="5-7401796\d4121ab1-02fd-4576-86dc-245e9382d365.jpg" /> and for<img src="5-7401796\1eb050f5-9e35-46f5-97ff-759714cc4f57.jpg" />, are expressed as a linear combination of <img src="5-7401796\404b0eb4-ad79-484d-8e01-e80bbc8f917f.jpg" /> for<img src="5-7401796\9af56450-9dfa-4975-bff8-4b91d81b647e.jpg" />, and of <img src="5-7401796\fb128138-f9c8-4b8e-8600-b662ff61ed58.jpg" /> for<img src="5-7401796\0ad0084e-2469-4378-9c00-dba2830215c9.jpg" />, respectively. The sum of the P-solutions <img src="5-7401796\fc88ea56-0966-41c0-84c0-7b163c21499c.jpg" /> of (3.7) for <img src="5-7401796\185aa2db-2b58-4666-84c1-f5aa9ad55f7d.jpg" /> and for <img src="5-7401796\b84c0342-2d17-49d9-902c-af8330050dc9.jpg" /> gives the P-solution <img src="5-7401796\894a52f4-6b77-4e9c-a568-81432e2b3810.jpg" /> of (3.4) and hence the P-solution <img src="5-7401796\d363edb2-564c-44cc-915a-4e7c716adbfb.jpg" /> of (3.2). The C-solution <img src="5-7401796\2ec12ac2-af3c-4b2e-9a76-42594cedc475.jpg" /> of (3.1) comes from the C-solution of (3.7) and the P-solution of (3.7) for<img src="5-7401796\71992c43-057b-408f-832c-7c4d14b0e039.jpg" />.</p></sec><sec id="s3_6"><title>3.6. Remarks</title><p>When we obtain <img src="5-7401796\5cb2b63a-b67d-4a77-868f-e2e68c1c4c53.jpg" /> at the end of Section 3.2, we must examine whether it is compatible with Condition B. We will find that if <img src="5-7401796\95c591b9-f33e-4f62-83ed-e38ce61468d7.jpg" /> for<img src="5-7401796\172fda71-14db-463f-8c38-e65a428c2564.jpg" />, the obtained <img src="5-7401796\297d2497-37b4-45e5-9985-8de7736f8142.jpg" /> is not acceptable. Hence we have to solve the problem, assuming that <img src="5-7401796\35c4dd2f-4472-4523-a80d-1cc6ec4bec48.jpg" /> for all<img src="5-7401796\397e1d9e-3290-495c-a180-c796e9c3b6c4.jpg" />.</p><p>When <img src="5-7401796\22b6be63-e554-489f-be63-2276daf9a58f.jpg" /> and<img src="5-7401796\d54f4c5d-8ce9-45c7-bff9-fe1c4d4d34dd.jpg" />, we put<img src="5-7401796\9d901fa9-d961-4765-9afc-3ff019936b64.jpg" />. When</p><p><img src="5-7401796\d56cb9ba-11d3-4293-83b0-3b3a3e7b3a1b.jpg" />and<img src="5-7401796\39107248-3ed5-49ea-aace-c368d4579b7b.jpg" />, we put<img src="5-7401796\77e12957-4f43-4e7f-8113-11564f05f886.jpg" />. Discussion of this problem is given in Appendices C and D of [<xref ref-type="bibr" rid="scirp.38844-ref4">4</xref>]. In the present case, the discussion must be read taking Condition B there to represent the present Condition B.</p></sec></sec><sec id="s4"><title>4. Laplace’s and Kummer’s DE</title><p>We now consider the case of σ = 1, m = 2, <img src="5-7401796\3c09e75c-ddf8-41a0-abda-48bbd502ef8f.jpg" />, and<img src="5-7401796\8ccc56dd-f1e6-479b-95ff-f5c5bec57a5b.jpg" />. Then (3.1) reduces to</p><disp-formula id="scirp.38844-formula112966"><label>(4.1)</label><graphic position="anchor" xlink:href="5-7401796\6090aefe-5036-490f-a352-1e1406f28486.jpg"  xlink:type="simple"/></disp-formula><p>By (3.5) and (3.6), <img src="5-7401796\f5c4000d-5a56-4238-bada-8ceb423d671e.jpg" />, <img src="5-7401796\6f1f5356-34d3-485e-b573-86adbad51914.jpg" />and <img src="5-7401796\68a202ce-cf09-4bd3-b556-14dc434c4a56.jpg" /> are</p><disp-formula id="scirp.38844-formula112967"><label>(4.2)</label><graphic position="anchor" xlink:href="5-7401796\e2dd774b-f652-435a-b9bc-cac2550e706b.jpg"  xlink:type="simple"/></disp-formula><disp-formula id="scirp.38844-formula112968"><label>(4.3)</label><graphic position="anchor" xlink:href="5-7401796\a564cbfe-53fc-4a25-a022-3f16e462c7d1.jpg"  xlink:type="simple"/></disp-formula><p>where<img src="5-7401796\c34510fd-b64b-4aca-8ac1-ed0e1c29f6b5.jpg" />.</p><sec id="s4_1"><title>4.1. Complementary Solution of (3.7), (3.2) and (4.1)</title><p>In order to obtain the C-solution <img src="5-7401796\02624c07-00d6-4ee6-ac37-e27fa7d8c173.jpg" /> of (3.7) by using (3.8), we express <img src="5-7401796\ba00e987-3c52-4025-bc03-b19cbd047def.jpg" /> as follows:</p><disp-formula id="scirp.38844-formula112969"><label>(4.4)</label><graphic position="anchor" xlink:href="5-7401796\24b2e7a4-a06c-48e4-9e24-8db8f5a023b1.jpg"  xlink:type="simple"/></disp-formula><p>where</p><disp-formula id="scirp.38844-formula112970"><label>(4.5)</label><graphic position="anchor" xlink:href="5-7401796\bbce6ee8-1aab-4ccb-bf3c-903206d7fdc8.jpg"  xlink:type="simple"/></disp-formula><p>B(x) is now expressed as<img src="5-7401796\ae5da173-d056-4b7c-a2b6-e5821e950288.jpg" />.</p><p>By using (3.8), we obtain</p><disp-formula id="scirp.38844-formula112971"><label>(4.6)</label><graphic position="anchor" xlink:href="5-7401796\4e6ee25f-5142-4efe-9f34-8109de06d1c8.jpg"  xlink:type="simple"/></disp-formula><p>where <img src="5-7401796\f69dacfa-4528-4d97-9a56-bc8af9443369.jpg" /> for <img src="5-7401796\83b845eb-6af0-4e61-ba8a-171420439e45.jpg" /> and <img src="5-7401796\471ab648-fed6-43aa-85d4-2f0ec2382007.jpg" /> are the binomial coefficients.</p><p>The C-solution of (3.2) is given by</p><disp-formula id="scirp.38844-formula112972"><label>(4.7)</label><graphic position="anchor" xlink:href="5-7401796\19a0901c-c94e-43ec-a171-a76a50444020.jpg"  xlink:type="simple"/></disp-formula><p>If<img src="5-7401796\aad3fb85-538c-43cf-b667-f4ec49e4d4a3.jpg" />, we obtain a C-solution of (4.1), by using Lemma 9:</p><disp-formula id="scirp.38844-formula112973"><label>(4.8)</label><graphic position="anchor" xlink:href="5-7401796\6389eb44-e544-45e6-a387-9a7e7f83d0fb.jpg"  xlink:type="simple"/></disp-formula><p>Remark 1 In Introduction, Kummer’s DE is given by (1.4). It is equal to (4.1) for<img src="5-7401796\8443890f-a05b-433f-a4a4-9b8f58947cd1.jpg" />, <img src="5-7401796\bd538ef3-8f10-45ad-8c93-f609e0ae00d4.jpg" />, <img src="5-7401796\2bcc350f-9ec1-4cd2-8960-aa824d17bba3.jpg" />and<img src="5-7401796\01efb946-e9c2-40eb-a2f0-92ea85751a62.jpg" />. In this case,</p><disp-formula id="scirp.38844-formula112974"><label>(4.9)</label><graphic position="anchor" xlink:href="5-7401796\c4c058a8-c0d5-4159-848f-8b2f1eb8e5d3.jpg"  xlink:type="simple"/></disp-formula><p>We then confirm that the expression (4.8) for <img src="5-7401796\43344ae2-c46d-4e0b-9d1a-464e1041c0aa.jpg" /> agrees with (1.6), which is one of the C-solutions of Kummer’s DE given in [7,8].</p></sec><sec id="s4_2"><title>4.2. Particular Solution of (3.7)</title><p>We now obtain the P-solution of (3.7), when the inhomogeneous term is equal to <img src="5-7401796\4ea9e97c-038d-4455-b846-da7d3b9fc660.jpg" /> for<img src="5-7401796\be2c864f-0161-4dee-b252-af4943d1b5c3.jpg" />.</p><p>When the C-solution of (3.7) is<img src="5-7401796\3e3b7a6f-cd70-4fd5-8820-20a6a8a36720.jpg" />, the P-solution of (3.7) is given by (3.9). By using (4.2) and (4.6), the following result is obtained in [<xref ref-type="bibr" rid="scirp.38844-ref4">4</xref>]:</p><disp-formula id="scirp.38844-formula112975"><label>(4.10)</label><graphic position="anchor" xlink:href="5-7401796\33cc07be-a628-41a4-9581-7800cb1b2aa5.jpg"  xlink:type="simple"/></disp-formula><p>where</p><disp-formula id="scirp.38844-formula112976"><label>(4.11)</label><graphic position="anchor" xlink:href="5-7401796\46a0a83a-790b-4619-830c-7472f4917bf4.jpg"  xlink:type="simple"/></disp-formula><p>Lemma 13 When<img src="5-7401796\e34a8e2a-aef5-4864-9c44-2b9f84fbbf8e.jpg" />, <img src="5-7401796\a2eda6c3-cb2e-405c-b604-878fb4ced11c.jpg" />defined by (4.11) is expressed as</p><disp-formula id="scirp.38844-formula112977"><label>(4.12)</label><graphic position="anchor" xlink:href="5-7401796\83160989-8eaa-4039-8f72-d5611e0c4f89.jpg"  xlink:type="simple"/></disp-formula><p>This lemma is proved in [<xref ref-type="bibr" rid="scirp.38844-ref4">4</xref>].</p></sec><sec id="s4_3"><title>4.3. Particular Solutions of (3.2) and (4.1)</title><p>Equation (4.10) shows that if the inhomogeneous term is <img src="5-7401796\7de92903-b04f-40b8-a94c-55a2174e172d.jpg" /> for<img src="5-7401796\1a9a58d9-2034-479f-8838-c73611d9bc4e.jpg" />, the P-solution of (3.2) is given by</p><disp-formula id="scirp.38844-formula112978"><label>(4.13)</label><graphic position="anchor" xlink:href="5-7401796\a0096116-cb92-4182-979e-5aa4d2e2c549.jpg"  xlink:type="simple"/></disp-formula><p>Theorem 1 Let<img src="5-7401796\4c7799c1-cf08-444a-bf66-5fbca708b743.jpg" />, <img src="5-7401796\bd83afe8-1533-44ef-8d81-59d3efb16a34.jpg" />, and<img src="5-7401796\5bf1119e-6f95-4083-b923-e7f88320eb62.jpg" />. Then we have a P-solution <img src="5-7401796\7851312d-9c48-44d4-885e-97ced9af7ebb.jpg" /> of (4.1), given by</p><disp-formula id="scirp.38844-formula112979"><label>(4.14)</label><graphic position="anchor" xlink:href="5-7401796\88040a20-6a82-4e8c-ab40-7f828b610b1f.jpg"  xlink:type="simple"/></disp-formula><p>where</p><disp-formula id="scirp.38844-formula112980"><label>(4.15)</label><graphic position="anchor" xlink:href="5-7401796\3c92c34a-d804-4f32-b572-5b3537e8da26.jpg"  xlink:type="simple"/></disp-formula><p>Proof Applying Lemma 9 to (4.13), we obtain</p><disp-formula id="scirp.38844-formula112981"><label>(4.16)</label><graphic position="anchor" xlink:href="5-7401796\6d947ac6-64ed-4286-881e-3d23c90a0071.jpg"  xlink:type="simple"/></disp-formula><p>By using (4.12) in (4.16), we obtain (4.14) with (4.15). <img src="5-7401796\e6f8eede-aa8c-49c8-b76d-5a77dd4b086e.jpg" /></p><p>We note that <img src="5-7401796\552138ad-8e4b-4250-80f5-a6f3ff6b6227.jpg" /> is expressed as</p><disp-formula id="scirp.38844-formula112982"><label>(4.17)</label><graphic position="anchor" xlink:href="5-7401796\58ea6b26-facd-4ffa-917f-140f9ad9b5bb.jpg"  xlink:type="simple"/></disp-formula><disp-formula id="scirp.38844-formula112983"><label>(4.18)</label><graphic position="anchor" xlink:href="5-7401796\afe032ce-4a1e-433c-b289-021667660d10.jpg"  xlink:type="simple"/></disp-formula></sec><sec id="s4_4"><title>4.4. Complementary Solution of (4.1)</title><p>By (4.3) and (4.5),<img src="5-7401796\4e0f3cca-ba08-4c43-aded-eb89cdcdf2cb.jpg" />. When</p><p><img src="5-7401796\f94ce983-5253-42e4-8db5-b023fd352906.jpg" />and<img src="5-7401796\08f5d2e8-0025-46b2-b07d-9732ffa44326.jpg" />, the P-solution of (4.7) is given by</p><disp-formula id="scirp.38844-formula112984"><label>(4.19)</label><graphic position="anchor" xlink:href="5-7401796\c91f7702-13fc-42df-bfa1-14c5bf36331e.jpg"  xlink:type="simple"/></disp-formula><p>By using (4.14) for<img src="5-7401796\e221bbba-c9df-437f-959d-a9d99128a93e.jpg" />, if<img src="5-7401796\a31a630f-b753-4280-bfd8-8427baa63560.jpg" />, we obtain a C-solution of (4.1):</p><disp-formula id="scirp.38844-formula112985"><label>(4.20)</label><graphic position="anchor" xlink:href="5-7401796\f7c11da1-ef8a-4f15-b978-bf28e2713555.jpg"  xlink:type="simple"/></disp-formula><p>In Section 4.1, we have (4.8), that is another C-solution of (4.1). If we compare (4.8) with (4.15), when<img src="5-7401796\4e2e2e2e-810f-48ce-82b2-40a1d69ce05e.jpg" />, it can be expressed as</p><disp-formula id="scirp.38844-formula112986"><label>(4.21)</label><graphic position="anchor" xlink:href="5-7401796\eca48570-90ff-4bb9-8bea-e171f1bd34c1.jpg"  xlink:type="simple"/></disp-formula><p>Proposition 1 When<img src="5-7401796\140159bf-735f-4e26-9c02-820a775119bd.jpg" />, the complementary solution of (4.1), multiplied by<img src="5-7401796\98608220-4403-4640-9337-f0badab816dc.jpg" />, is given by the sum of the righthand sides of (4.8) and of (4.20), which are equal to <img src="5-7401796\1723d95f-a57f-4247-827c-71d3253ee92e.jpg" /> and<img src="5-7401796\9793b592-7a5d-4abe-aae7-67961ad83841.jpg" />respectively.</p><p>Remark 2 As stated in Remark 1, for Kummer’s DE, <img src="5-7401796\530efb16-db55-46be-b6b4-51b81e7048db.jpg" />and <img src="5-7401796\758c9acc-04e0-46b2-a953-adbbed528bd1.jpg" /> are given in (4.9), and</p><disp-formula id="scirp.38844-formula112987"><label>(4.22)</label><graphic position="anchor" xlink:href="5-7401796\74e00067-74cc-49a4-94fc-2c679ae8f959.jpg"  xlink:type="simple"/></disp-formula><p>We then confirm that if<img src="5-7401796\9eaf5ddd-fb20-42c7-80bf-c6f4749d712f.jpg" />, the set of (4.8) and (4.20) agrees with the set of (4.5) and (4.6).</p></sec><sec id="s4_5"><title>4.5. Remarks</title><p>In [<xref ref-type="bibr" rid="scirp.38844-ref10">10</xref>], it was shown that there exist P-solutions expressed by a polynomial for inhomogeneous Hermite’s DE, et al. We can obtain the corresponding result for Laplace’s DE. We discuss this problem in Appendix A, and then discuss the P-solution of inhomogeneous Hermite’s DE in the present formulation in Appendix B.</p></sec></sec><sec id="s5"><title>5. Solution of fDE (3.1) for <img src="5-7401796\63a0a436-070e-44df-8547-740d57dd918b.jpg" /></title><p>In this section, we consider the case of<img src="5-7401796\689f6db0-e2f4-48f0-8d64-03633937c9ee.jpg" />, <img src="5-7401796\201d6271-bbec-43d4-a851-7da1d50f3958.jpg" />,</p><p><img src="5-7401796\89149139-d0d7-4d55-840b-cde7ebd80b83.jpg" />, and<img src="5-7401796\15ec4c7e-ace5-40d4-9f69-1474fcdb675d.jpg" />Then the Equation (3.1) to be solved is</p><disp-formula id="scirp.38844-formula112988"><label>(5.1)</label><graphic position="anchor" xlink:href="5-7401796\1c369b7a-d725-49df-8089-45d1ee109929.jpg"  xlink:type="simple"/></disp-formula><p>Now (3.5) and (3.6) are expressed as</p><disp-formula id="scirp.38844-formula112989"><label>(5.2)</label><graphic position="anchor" xlink:href="5-7401796\d937db10-0e5b-4b62-8da9-ebbbbc24cdb9.jpg"  xlink:type="simple"/></disp-formula><disp-formula id="scirp.38844-formula112990"><label>(5.3)</label><graphic position="anchor" xlink:href="5-7401796\fd02cd8a-011c-4df5-995d-df0d6c52ce24.jpg"  xlink:type="simple"/></disp-formula><p>where<img src="5-7401796\a7bf65bf-833b-453a-8bd2-c21a74f7c08d.jpg" />.</p><sec id="s5_1"><title>5.1. Complementary Solution of (3.7)</title><p>By using (5.2), <img src="5-7401796\b6e7f333-beb6-405c-a935-470b136c8b59.jpg" />is expressed as</p><disp-formula id="scirp.38844-formula112991"><label>(5.4)</label><graphic position="anchor" xlink:href="5-7401796\047c3522-1968-4229-ada4-b6946a9fb00d.jpg"  xlink:type="simple"/></disp-formula><p>where</p><disp-formula id="scirp.38844-formula112992"><label>(5.5)</label><graphic position="anchor" xlink:href="5-7401796\8ea304c5-0c7c-43f2-b1e9-e31aaa6d251b.jpg"  xlink:type="simple"/></disp-formula><p>By (3.8), the C-solution <img src="5-7401796\a869c13a-a065-47af-aa0f-e3ccd8af7739.jpg" /> of (3.7) is given by</p><disp-formula id="scirp.38844-formula112993"><label>(5.6)</label><graphic position="anchor" xlink:href="5-7401796\b4dfa5cf-38d4-4d93-b6f9-77ee25fb2342.jpg"  xlink:type="simple"/></disp-formula></sec><sec id="s5_2"><title>5.2. Complementary Solution of (3.2) and (5.1)</title><p>The C-solution of (3.2) is given by</p><disp-formula id="scirp.38844-formula112994"><label>(5.7)</label><graphic position="anchor" xlink:href="5-7401796\8b08f882-408d-46d1-963e-ef2e94b65932.jpg"  xlink:type="simple"/></disp-formula><p>If<img src="5-7401796\647a8f17-9b30-4f64-9e1c-24535860ea89.jpg" />, by applying Lemma 9 to this, we obtain the C-solution of (5.1):</p><disp-formula id="scirp.38844-formula112995"><label>(5.8)</label><graphic position="anchor" xlink:href="5-7401796\dabddd96-2d18-491d-9d04-8be514ea2b85.jpg"  xlink:type="simple"/></disp-formula></sec><sec id="s5_3"><title>5.3. Particular Solution of (3.2) and (5.1)</title><p>By using the expressions of <img src="5-7401796\43962e44-9627-4b61-9156-391338f1b5b5.jpg" /> and <img src="5-7401796\876f01e9-21ea-4902-914d-d92a7abe89e6.jpg" /> given by (5.2) and (5.6) in (3.9), we obtain the P-solution of (3.7), when the inhomogeneous term is <img src="5-7401796\8f52d7f6-6975-45fe-b4f4-7b8b44405b18.jpg" /> for<img src="5-7401796\86926ba3-bcb2-4e32-8c02-9f4ec13a3893.jpg" />:</p><disp-formula id="scirp.38844-formula112996"><label>(5.9)</label><graphic position="anchor" xlink:href="5-7401796\f3dab78b-60c9-48e8-afad-c828002aa3b4.jpg"  xlink:type="simple"/></disp-formula><p>where <img src="5-7401796\4190889e-eec1-4bb3-a6d7-ca1cc636c47c.jpg" /> is defined by (4.11) and is given by</p><p>(4.12), if<img src="5-7401796\02c817b8-7ab1-49f4-8c03-4bb5d9068145.jpg" />.</p><p>By using (4.12) in (5.9), we can show that if the inhomogeneous term is <img src="5-7401796\8ea518a7-de67-4fd7-9709-78e0526c9170.jpg" /> for<img src="5-7401796\534e1033-55b9-4e2f-8a8c-38b7f72df095.jpg" />, the P-solution of (3.2) is<img src="5-7401796\e961eee3-3af5-4ca5-a81f-b5637775bcbe.jpg" />. By applying Lemma 9 to this, we obtain the following theorem.</p><p>Theorem 2 Let<img src="5-7401796\d8239851-2de8-4cd9-b78d-6f016b14c6c5.jpg" />, <img src="5-7401796\fc5cb92d-bbc0-46da-ab58-c0ffed59bd7d.jpg" />and <img src="5-7401796\02673db4-893d-4aae-9521-8d0c2fbfd169.jpg" />. Then we have a P-solution <img src="5-7401796\43349673-dcfc-4ed9-bec3-90af9b272420.jpg" /></p><p>of (5.1), given by</p><disp-formula id="scirp.38844-formula112997"><graphic  xlink:href="5-7401796\28ed9fda-b5f3-423d-8043-ec2eb20e5e5d.jpg"  xlink:type="simple"/></disp-formula><disp-formula id="scirp.38844-formula112998"><label>(5.10)</label><graphic position="anchor" xlink:href="5-7401796\6dc08388-8653-4a7d-8b7a-6aad735e88c0.jpg"  xlink:type="simple"/></disp-formula><p>where</p><disp-formula id="scirp.38844-formula112999"><label>(5.11)</label><graphic position="anchor" xlink:href="5-7401796\1477bf24-f7d7-4579-b9d0-d6d7b87fe020.jpg"  xlink:type="simple"/></disp-formula><p>In Appendix C, discussion is given to show that there exist P-solutions in the form of polynomial for (5.1).</p></sec><sec id="s5_4"><title>5.4. Complementary Solution of (5.1)</title><p>We obtain the solution <img src="5-7401796\285758ab-6054-4d94-ae64-6b5fa8940fce.jpg" /> only for<img src="5-7401796\83919631-b26e-40e9-a204-bc759d861a6a.jpg" />. Even though we have P-solutions of (3.2) for<img src="5-7401796\faae79ab-85b2-4d83-8132-d01099a1af8b.jpg" />, when <img src="5-7401796\e5c820af-0bb2-4859-8db8-1d5bdc9a36ab.jpg" /> is given by (5.3) with nonzero values of<img src="5-7401796\e5e18862-00e1-4049-9af4-e5388c1314d5.jpg" />, it does not satisfy Condition B, and does not give a solution of (5.1). Hence <img src="5-7401796\17b2fab1-645a-4e6f-9d3f-0831cb4567c4.jpg" /> given by (5.8) is the only C-solution of (5.1).</p><p>If we compare (5.8) with (5.11), we obtain the following proposition.</p><p>Proposition 2 Let<img src="5-7401796\96e9d5b9-d49e-4eef-8b89-eb45ba746b08.jpg" />. Then the C-solution of (5.1) is given by</p><disp-formula id="scirp.38844-formula113000"><label>(5.12)</label><graphic position="anchor" xlink:href="5-7401796\0b0fb23e-aeee-443d-b6ee-f725612e3f5e.jpg"  xlink:type="simple"/></disp-formula></sec></sec><sec id="s6"><title>REFERENCES</title></sec><sec id="s7"><title>Appendix A: Polynomial Form of P-Solution of (4.1)</title><p>Let <img src="5-7401796\e501923d-cb4d-4454-9190-723a953c24e2.jpg" /> and<img src="5-7401796\e75648f8-344a-4265-8942-27bf789f8578.jpg" />. Then (4.15) gives</p><disp-formula id="scirp.38844-formula113001"><label>(A.1)</label><graphic position="anchor" xlink:href="5-7401796\dc757d4c-3ca8-4224-b063-bfe80032f98e.jpg"  xlink:type="simple"/></disp-formula><disp-formula id="scirp.38844-formula113002"><label>(A.2)</label><graphic position="anchor" xlink:href="5-7401796\1464d44f-f4fd-4e1a-92d5-ff2e760c2588.jpg"  xlink:type="simple"/></disp-formula><p>where</p><disp-formula id="scirp.38844-formula113003"><label>(A.3)</label><graphic position="anchor" xlink:href="5-7401796\b6d786e0-a698-4cd2-9e88-efa57e032e6f.jpg"  xlink:type="simple"/></disp-formula><p>We obtain the following theorems from (A.2) with the aid of Proposition 1.</p><p>Theorem 3 Let<img src="5-7401796\5b82e11f-121a-452d-84c7-51bee3fdb48a.jpg" />, <img src="5-7401796\333e8881-f1a3-4ae0-95ba-4fe8ecff6d27.jpg" />, and<img src="5-7401796\490a13fb-02f5-49fb-a91f-b182d432b151.jpg" />. Then we have the polynomial form of P-solution of (4.1):</p><disp-formula id="scirp.38844-formula113004"><label>(A.4)</label><graphic position="anchor" xlink:href="5-7401796\a71922b4-355b-4470-abab-e3d854e9f502.jpg"  xlink:type="simple"/></disp-formula><p>Theorem 4 Let<img src="5-7401796\8d9174b1-eb4c-4594-be4c-ac308ab66d4a.jpg" />, <img src="5-7401796\8cd3a600-de7d-40e5-b58a-e7be8537bd70.jpg" />, <img src="5-7401796\41e996ae-703e-47bd-8a29-1cb06390a6f5.jpg" />and <img src="5-7401796\2a7a701c-c752-4262-ad01-70c051fd4b70.jpg" /> for<img src="5-7401796\f60999d0-cdcb-4614-9543-2c4549990b08.jpg" />. Then we have the polynomial form of P-solution of (4.1):</p><disp-formula id="scirp.38844-formula113005"><label>(A.5)</label><graphic position="anchor" xlink:href="5-7401796\c1d618a3-704a-46ca-bec8-e2526177d3e4.jpg"  xlink:type="simple"/></disp-formula></sec><sec id="s8"><title>Appendix B: Polynomial Form of P-Solution of Hermite DE</title><p>We now consider the inhomogeneous Hermite DE given by</p><disp-formula id="scirp.38844-formula113006"><label>(B.1)</label><graphic position="anchor" xlink:href="5-7401796\d679aba5-e8ba-4ecf-9891-5ca3d417fb36.jpg"  xlink:type="simple"/></disp-formula><p>for <img src="5-7401796\3cae4c3b-0bbb-4638-bfea-20ff33c3753b.jpg" /> and<img src="5-7401796\ef06a37e-d7f7-4f8b-9e95-ddd0f926064a.jpg" />. We put <img src="5-7401796\2346698b-b2cf-4fc4-91a4-6198a03b54d4.jpg" /> and<img src="5-7401796\a6a16f31-de9f-43e5-9bdd-c52c1aff7dc1.jpg" />. Then the equation for <img src="5-7401796\3f739c94-3d99-4595-b497-2ce02cba4f5f.jpg" /> is given by</p><disp-formula id="scirp.38844-formula113007"><label>(B.2)</label><graphic position="anchor" xlink:href="5-7401796\e6a181db-d044-455d-a652-fe4f4df0da8f.jpg"  xlink:type="simple"/></disp-formula><p>This is Laplace’s DE (4.1) with parameters</p><disp-formula id="scirp.38844-formula113008"><label>(B.3)</label><graphic position="anchor" xlink:href="5-7401796\097293bb-113c-4138-9915-ec3374d27ab5.jpg"  xlink:type="simple"/></disp-formula><p>and the inhomogeneous term<img src="5-7401796\7b00a668-e4ac-4a8d-9608-0c5779cc94e3.jpg" />.</p><p>Theorem 5 Let<img src="5-7401796\4915038f-0dfd-4e39-955b-3bafa6eaa10e.jpg" />, <img src="5-7401796\bcf739e6-c3e6-42bc-9d66-5af93e4f8cec.jpg" />, and<img src="5-7401796\d277eb60-d8c5-45f0-aec7-40c1b43a8c93.jpg" />,<img src="5-7401796\ec432e4b-e155-44e0-a685-862122491f91.jpg" />. Then we have the polynomial form of Psolution of (B.2):</p><disp-formula id="scirp.38844-formula113009"><label>(B.4)</label><graphic position="anchor" xlink:href="5-7401796\1cc3eb00-6302-4049-bfdb-89f65565fd5a.jpg"  xlink:type="simple"/></disp-formula><p>Proof In this case, <img src="5-7401796\f1ecfebf-e332-4c1e-91ad-ae6c94a6b56a.jpg" />, <img src="5-7401796\0d353316-5a09-4203-97f7-b3771b782dd3.jpg" />, and</p><p><img src="5-7401796\b62c580a-bee9-4950-b164-501bd798073d.jpg" />. By Theorem 3, we obtain this result. <img src="5-7401796\89379e02-142c-4b50-a7b6-08614f01e20c.jpg" /></p><p>Theorem 6 Let<img src="5-7401796\dfa2bcc0-defc-45d9-a47e-88440e9530a5.jpg" />, <img src="5-7401796\dd0b262f-843d-4ec3-9e5e-8211cab01894.jpg" />, and<img src="5-7401796\ad5f264e-bdb4-4593-8461-bd193b13238b.jpg" />,<img src="5-7401796\9dc85116-260d-4c86-9e9e-8ddd3048947d.jpg" />. Then we have the polynomial form of Psolution of (B.2):</p><disp-formula id="scirp.38844-formula113010"><label>(B.5)</label><graphic position="anchor" xlink:href="5-7401796\cb15e274-cd5f-46b5-989c-a9c274a97f0e.jpg"  xlink:type="simple"/></disp-formula><p>Proof In this case, <img src="5-7401796\8f1a2c1d-1182-488f-9adf-fcca01f8b379.jpg" />, <img src="5-7401796\0270f5c1-e24d-4663-921c-61c9d6a1a109.jpg" />, and<img src="5-7401796\b7b602be-1d04-42a1-9777-2fcfee21bf6d.jpg" />. By Theorem 4, we obtain this result. <img src="5-7401796\a63808fa-66dc-4fbd-a349-9f5cd1376a5f.jpg" /></p><p>Theorem 7 Let<img src="5-7401796\e26a77e7-5242-4fcb-a12d-d1ef4b06a082.jpg" />, <img src="5-7401796\0419ef87-8aeb-4f3a-9cb1-4322c66cfe6d.jpg" />, and<img src="5-7401796\f6aa74f3-4916-4f12-a364-a6faac13ea40.jpg" />,<img src="5-7401796\2d33cfed-b913-41d2-bacf-387029660b17.jpg" />. Then we have the polynomial form of Psolution of (B.2):</p><disp-formula id="scirp.38844-formula113011"><label>(B.6)</label><graphic position="anchor" xlink:href="5-7401796\1be47ea0-22c4-48d6-bc6b-81b248365b34.jpg"  xlink:type="simple"/></disp-formula><p>Proof In this case, <img src="5-7401796\77320644-7714-4def-8486-4d7ed829fb10.jpg" />, <img src="5-7401796\9bbc9f2d-9730-4437-846d-95023ee3b538.jpg" />, and<img src="5-7401796\f5423069-a5c6-4940-8585-0acddc8c7402.jpg" />. By Theorem 4, we obtain this result. <img src="5-7401796\7ca52a1d-1c42-477d-915e-cbacee1964da.jpg" /></p><p>Theorem 8 Let<img src="5-7401796\f6e1d22a-6cf7-4cc3-be8d-271c047c9ab1.jpg" />, <img src="5-7401796\c708d1d5-b97f-48d6-a21b-1d497d5f6889.jpg" />, and<img src="5-7401796\8de74c4a-6323-4cf3-84d3-57fd69929474.jpg" />,<img src="5-7401796\dc50b5d8-0718-4f18-83ec-7c2edc6087e5.jpg" />. Then we have the polynomial form of Psolution of (B.2):</p><disp-formula id="scirp.38844-formula113012"><label>(B.7)</label><graphic position="anchor" xlink:href="5-7401796\ec2cc7e2-8b96-440d-af0b-b4741a09708a.jpg"  xlink:type="simple"/></disp-formula><p>Proof In this case, <img src="5-7401796\1a132592-325b-43ba-bbae-48055bc522c5.jpg" />, <img src="5-7401796\567c3c1b-92cd-4546-822d-bb60bf992f6e.jpg" />, and<img src="5-7401796\419b947d-14e7-471f-9f73-9eda3e07ea2b.jpg" />. By Theorem 3, we obtain this result. <img src="5-7401796\50907048-03b1-486c-8cb0-680111a8d4e3.jpg" /></p><p>Remark 3 We confirm that Theorems 7 and 5, respectively, agree with Theorems 1 and 2 in [<xref ref-type="bibr" rid="scirp.38844-ref10">10</xref>].</p></sec><sec id="s9"><title>Appendix C: Polynomial Form of P-Solution of (5.1)</title><p>Let <img src="5-7401796\dd5c6951-b548-4824-92f9-604131a9b0c0.jpg" /> and<img src="5-7401796\bcf5c63a-c893-47dd-b665-1a989df7ca4d.jpg" />. Then (5.11) gives</p><disp-formula id="scirp.38844-formula113013"><label>(C.1)</label><graphic position="anchor" xlink:href="5-7401796\361f8bb5-a1b8-4c0c-bf2e-a01d69a1176c.jpg"  xlink:type="simple"/></disp-formula><disp-formula id="scirp.38844-formula113014"><label>(C.2)</label><graphic position="anchor" xlink:href="5-7401796\db4e3dd8-c0ee-4590-9c97-e42f386d5288.jpg"  xlink:type="simple"/></disp-formula><p>where</p><disp-formula id="scirp.38844-formula113015"><label>(C.3)</label><graphic position="anchor" xlink:href="5-7401796\de2ae453-04c4-4052-a49f-be1c5e974ccd.jpg"  xlink:type="simple"/></disp-formula><p>We obtain the following theorem from (C.2) with the aid of Proposition 2.</p><p>Theorem 9 Let<img src="5-7401796\a6ba4a91-38be-40dd-9cb1-b47ad7384006.jpg" />, <img src="5-7401796\2aa247ce-dc01-4813-889e-1a62d23a09dd.jpg" />, <img src="5-7401796\81dd0291-5e6b-44fc-b03e-14b2ab53dd2e.jpg" />and <img src="5-7401796\aae4b15f-4c9b-46d2-a471-267f665f50d3.jpg" /> for<img src="5-7401796\a86dbd85-3986-4750-a65d-1e6aa166d973.jpg" />. Then we have the polynomial form of P-solution of (5.1):</p><disp-formula id="scirp.38844-formula113016"><label>(C.4)</label><graphic position="anchor" xlink:href="5-7401796\3d958d52-6ad1-42d0-bbc3-4cfb2aa79047.jpg"  xlink:type="simple"/></disp-formula></sec></body><back><ref-list><title>References</title><ref id="scirp.38844-ref1"><label>1</label><mixed-citation publication-type="other" xlink:type="simple">K. Yosida, “The Algebraic Derivative and Laplace’s Differential Equation,” Proceedings of the Japan Academy, Vol. 59, Ser. A, 1983, pp. 1-4.</mixed-citation></ref><ref id="scirp.38844-ref2"><label>2</label><mixed-citation publication-type="other" xlink:type="simple">K. Yosida, “Operational Calculus,” Springer-Verlag, New York, 1982, Chapter VII.</mixed-citation></ref><ref id="scirp.38844-ref3"><label>3</label><mixed-citation publication-type="other" xlink:type="simple">J. Mikusiński, “Operational Calculus,” Pergamon Press, London, 1959.</mixed-citation></ref><ref id="scirp.38844-ref4"><label>4</label><mixed-citation publication-type="other" xlink:type="simple">T. Morita and K. Sato, “Remarks on the Solution of Laplace’s Differential Equation and Fractional Differential Equation of That Type,” Applied Mathematics, Vol. 4, No. 11A, 2013, pp. 13-21.</mixed-citation></ref><ref id="scirp.38844-ref5"><label>5</label><mixed-citation publication-type="other" xlink:type="simple">T. Morita and K. Sato, “Solution of Fractional Differential Equation in Terms of Distribution Theory,” Interdisciplinary Information Sciences, Vol. 12, No. 2, 2006, pp. 71-83.</mixed-citation></ref><ref id="scirp.38844-ref6"><label>6</label><mixed-citation publication-type="other" xlink:type="simple">T. Morita and K. Sato, “Neumann-Series Solution of Fractional Differential Equation,” Interdisciplinary Information Sciences, Vol. 16, No. 1, 2010, pp. 127-137.</mixed-citation></ref><ref id="scirp.38844-ref7"><label>7</label><mixed-citation publication-type="other" xlink:type="simple">M. Abramowitz and I. A. Stegun, “Handbook of Mathematical Functions with Formulas, Graphs and Mathematical Tables,” Dover Publ., Inc., New York, 1972, Chapter 13.</mixed-citation></ref><ref id="scirp.38844-ref8"><label>8</label><mixed-citation publication-type="other" xlink:type="simple">M. Magnus and F. Oberhettinger, “Formulas and Theorems for the Functions of Mathematical Physics,” Chelsea Publ. Co., New York, 1949, Chapter VI.</mixed-citation></ref><ref id="scirp.38844-ref9"><label>9</label><mixed-citation publication-type="other" xlink:type="simple">T. Morita and K. Sato, “Liouville and Riemann-Liouville Fractional Derivatives via Contour Integrals,” Fractional Calculus and Applied Analysis, Vol. 16, No. 3, 2013, pp. 630-653.</mixed-citation></ref><ref id="scirp.38844-ref10"><label>10</label><mixed-citation publication-type="other" xlink:type="simple">L. Levine and R. Maleh, “Polynomial Solutions of the Classical Equations of Hermite, Legendre and Chebyshev,” International Journal of Mathematical Education in Science and Technology, Vol. 34, 2003, pp. 95-103.</mixed-citation></ref><ref id="scirp.38844-ref11"><label>11</label><mixed-citation publication-type="other" xlink:type="simple">F. Riesz and B. Sz.-Nagy, “Functional Analysis,” Dover Publ., Inc., New York, 1990, p. 146.</mixed-citation></ref></ref-list></back></article>