Quadratic functional equation - Open Access .click

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On the Stability of an Additive and Quadratic Functional Equation

2012
In Park et al. (J. Chungcheong Math. Soc. 21:455–466, 2008) considered the following Jensen additive and quadratic type functional equation $$2 f \biggl(\frac{x+y}{2} \biggr) + f \biggl( \frac{x-y}{2} \biggr ) + f \biggl(\frac{y-x}{2} \biggr) = f(x) + f(y) .
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Non-Archimedean stability of a generalized reciprocal-quadratic functional equation in several variables by direct and fixed point methods

, 2018
B. V. S. Kumar, H. Dutta
semanticscholar +1 more source

A Variant of a Generalized Quadratic Functional Equation on Groups

, 2017
H. H. Elfen, T. Riedel, P. K. Sahoo
semanticscholar +1 more source

The quadratic function and the quadratic equation

1983
B.D. Bunday, H. Mulholland
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THE QUADRATIC FUNCTION AND THE QUADRATIC EQUATION

1968
C. PLUMPTON, W.A. TOMKYS
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SARS-CoV-2 variants, spike mutations and immune escape

Nature Reviews Microbiology, 2021
William T Harvey +2 more
exaly

Lipschitz stability of the k-quadratic functional equation

, 2017
A. Chahbi, Iz-iddine El-Fassi, S. Kabbaj
semanticscholar +1 more source