Ulam Stability Results of Functional Equations in Modular Spaces and 2-Banach Spaces
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Date
2023-01
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Abstract
In this work, we investigate the refined stability of the additive, quartic, and quintic func tional equations in modular spaces with and without the ∆2-condition using the direct method (Hyers
method). We also examine Ulam stability in 2-Banach space using the direct method. Additionally,
using a suitable counterexample, we eventually demonstrate that the stability of these equations fails
in a certain case.