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Kyritsis, K. (2022) The Newton-Leibniz Number-Fields of Fluxions and Infinitesimals and the New Applied Democritus Digital Calculus of the 21^st Century. A Partial Similarity of Theory and Practice Captured as Instances of the Axiomatic System of Abstract Calculi over Multi-Density Quantities. Lambert Academic Publishing.
https://www.researchgate.net/publication/358425683_THE_NEWTON-LEIBNIZ_FIELDS_OF_FLUXIONS_AND_INFINITESIMALS_AND_THE_NEW_APPLIED_DEMOCRITUS_DIGITAL_CALCULUS_OF_THE_21ST_CENTURY_A_partial_similarity_of_theory_and_practice

has been cited by the following article:

• TITLE: A Short and Simple Solution of the Millennium Problem about the Navier-Stokes Equations and Similarly for the Euler Equations

  AUTHORS: Konstantinos E. Kyritsis

  KEYWORDS: Incompressible Flows, Regularity, Blow-Up, Navier-Stokes Equations, Euler Equations, Clay Millennium Problem

  JOURNAL NAME: Journal of Applied Mathematics and Physics, Vol.10 No.8, August 31, 2022

  ABSTRACT: This paper presents a very short solution to the 4th Millennium problem about the Navier-Stokes equations. The solution proves that there cannot be a blow up in finite or infinite time, and the local in time smooth solutions can be extended for all times, thus regularity. This happily is proved not only for the Navier-Stokes equations but also for the inviscid case of the Euler equations both for the periodic or non-periodic formulation and without external forcing (homogeneous case). The proof is based on an appropriate modified extension in the viscous case of the well-known Helmholtz-Kelvin-Stokes theorem of invariance of the circulation of velocity in the Euler inviscid flows. This is essentially a 1D line density of (rotatory) momentum conservation. We discover a similar 2D surface density of (rotatory) momentum conservation. These conservations are indispensable, besides to the ordinary momentum conservation, to prove that there cannot be a blow-up in finite time, of the point vorticities, thus regularity.