hyers-ulam-rassias stability of a composite functional equation in various normed spaces

Authors

h. azadi kenary

yasouj university

abstract

in this paper, we prove the generalized hyers-ulam(or hyers-ulam-rassias ) stability of the following composite functional equation f(f(x)-f(y))=f(x+y)+f(x-y)-f(x)-f(y) in various normed spaces.

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Journal title:
bulletin of the iranian mathematical society

جلد ۳۹، شماره ۳، صفحات ۳۸۳-۴۰۳

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