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math.FA2008
The stability of a quadratic type functional equation with the fixed point alternative
M. Eshaghi Gordji, H. Khodaei
In this paper, we achieve the general solution and the generalized Hyers-Ulam-Rassias stability for the quadratic type functional equation &f(x+y+2cz)+f(x+y-2cz)+c^2f(2x)+c^2f(2y)…
math.FA2008
Solution and stability of generalized mixed type cubic, quadratic and additive functional equation in quasi-Banach spaces
M. Eshaghi Gordji, H. Khodaei
In this paper, we achieve the general solution and the generalized Hyers-Ulam-Rassias stability of the following functional equation $$f(x+ky)+f(x-ky)=k^2f(x+y)+k^2f(x-y)+2(1-k^2)f…