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Weisstein, E.W. Characteristic Equation. MathWorld—A Wolfram Web Resource.
http://mathworld.wolfram.com/CharacteristicEquation.html

has been cited by the following article:

• TITLE: Obtaining a New Representation for the Golden Ratio by Solving a Biquadratic Equation

  AUTHORS: Leonardo Mondaini

  KEYWORDS: Golden Ratio, Algebraic Equations, Recreational Mathematics, History of Mathematics

  JOURNAL NAME: Journal of Applied Mathematics and Physics, Vol.2 No.13, December 22, 2014

  ABSTRACT: In the present work we show how different ways to solve biquadratic equations can lead us to different representations of its solutions. A particular equation which has the golden ratio and its reciprocal as solutions is shown as an example.