On the hyperstablity of a quadratic functional equation in commutative groups

Abdulaziz Shaiea, Muaadh Almahalebi

Résumé


Using the Brzde¸k’s fixed point method, we prove the hyperstablity of the functional equation f (x+y+z)+ f (x+y


Mots-clés


Hyers-Ulam stability; hyperstability; quadratic functional equation; fixed point method; complete metric space.

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