On the Generalized Hyers–Ulam–Rassias Stability of an n-Dimensional Quadratic Functional Equation

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D. H. Hyers · Proceedings of the National Academy of Sciences · 1941 · 4K citations · Full text

Natural Sciences, Mathematics, Differential Equations +7

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Zbigniew Gajda · International Journal of Mathematics and Mathematical Sciences · 1991 · 854 citations · Full text

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Remarks on the stability of functional equations

Piotr W. Cholewa · Aequationes Mathematicae · 1984 · 591 citations

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On the Stability of Functional Equations and a Problem of Ulam

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Natural Sciences, Mathematics, Differential Equations +11

Approximate homomorphisms

D. H. Hyers, Themistocles M. Rassias · Aequationes Mathematicae · 1992 · 541 citations · Full text