On the Orthogonal Stability of the Pexiderized Quadratic Equation
Mohammad Sal Moslehian
math.FAarXiv:math/0412475
Abstract
The Hyers--Ulam stability of the conditional quadratic functional equation of Pexider type f(x+y)+f(x-y)=2g(x)+2h(y), x y is established where is a symmetric orthogonality in the sense of Ratz and f is odd.
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