A Note on the Stability of Functional Equations via a Celebrated Direct Method
A Note on the Stability of Functional Equations via a Celebrated Direct Method
More than ten years after Justyna Sikorska [8] attempted to solve the Heyers-Ulam stability of a single variable equation by using direct method. In this paper, we will improve the results of Justyna Sikorska by using a more efficient approach. Relations between the generalized functional equation, the dependence of their …