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Solution and stability of a functional equation deriving from additive, quadratic and quartic in quasi-Banach spaces

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In this paper, we investigate the general solution of the following functional equation $$f(x+3y)+f(x-3y)=9(f(x+y)+f(x-y))+12f(y)-12f(2y)+4f(3y)-16f(x)$$ and discuss its Hyers-Ulam stability in quasi-Banach spaces.

Abstract

In this paper, we investigate the general solution of the following functional equation $$f(x+3y)+f(x-3y)=9(f(x+y)+f(x-y))+12f(y)-12f(2y)+4f(3y)-16f(x)$$ and discuss its Hyers-Ulam stability in quasi-Banach spaces.

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