Abstract
In this paper, we unify the system of functional equations defining a multi-Jensen-quadratic mapping to obtain a single equation. We also prove, using the fixed point method, the generalized Hyers–Ulam stability of this equation both in Banach spaces and in complete non-Archimedean normed spaces.
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Bahyrycz, A., Ciepliński, K. On an equation characterizing multi-Jensen-quadratic mappings and its Hyers–Ulam stability via a fixed point method. J. Fixed Point Theory Appl. 18, 737–751 (2016). https://doi.org/10.1007/s11784-016-0298-8
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DOI: https://doi.org/10.1007/s11784-016-0298-8