Abstract
In this paper we prove, using the fixed point method, the generalized Hyers–Ulam stability of two functional equations in complete non-Archimedean normed spaces. One of these equations characterizes multi-Cauchy–Jensen mappings, and the other gives a characterization of multi-additive-quadratic mappings.
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Bahyrycz, A., Ciepliński, K. & Olko, J. On Hyers–Ulam stability of two functional equations in non-Archimedean spaces. J. Fixed Point Theory Appl. 18, 433–444 (2016). https://doi.org/10.1007/s11784-016-0288-x
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DOI: https://doi.org/10.1007/s11784-016-0288-x