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On the Ulam stability of mixed type mappings on restricted domains. (English) Zbl 1021.39015
The author investigates the stability of several functional equations characterizing additive and quadratic mappings on unrestricted but also restricted domains.

MSC:
39B82Stability, separation, extension, and related topics
39B52Functional equations for functions with more general domains and/or ranges
47H99Nonlinear operators