Abstract
In this manuscript, we study the properties and equivalence results for different forms of quadratic functional equations. Using the Brzdȩk and Ciepliński fixed‐point approach, we investigate the generalized Hyers–Ulam–Rassias stability for the 3‐variables quadratic functional equation in the setting of 2‐Banach space. Also, we obtain some hyperstability results for the 3‐variables quadratic functional equation. The results obtained in this paper extend several known results of the literature to the setting of 2‐Banach space.
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