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On approximation of approximately quadratic mappings by quadratic mappings. (English) Zbl 1087.39518
Summary: We establish an approximation of approximately quadratic mappings by quadratic mappings, which solves the pertinent Ulam stability problem.

MSC:
39B82 Stability, separation, extension, and related topics for functional equations
39B52 Functional equations for functions with more general domains and/or ranges
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