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Fixed Points and the Stability of an AQCQ-Functional Equation in Non-Archimedean Normed Spaces
Using fixed point method, we prove the generalized HyersâUlam stability of the following additiveâquadraticâcubicâquartic functional equation f ( x + 2 y ) + f ( x â 2 y ) = 4 f ( x + y ) + 4 f ( x â y ) â 6 f âŚ