Stability of quadratic functional equation in modular spaces
Abstract
In this paper, we study the Hyers-Ulam stability of the following equation multline* φ(x+y-z)+φ(x+z-y)+φ(y+z-x)=φ (x-y)+φ(x-z)+φ(z-y) +φ(x)+φ(y) +φ(z) multline* in modular space, with or without 2-condition, and in β-homogeneous Banach space.
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