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- W3213077971 abstract "The theory of Ulam stability was initiated by a problem raised in 1940 by S. Ulam and concerning approximate solutions to the equation of homomorphism in groups. It is somehow connected to various other areas of investigation such as, e.g., optimization and approximation theory. Its main issue is the error that we make when replacing functions satisfying the equation approximately with exact solutions of the equation. This article is a survey of the published so far results on Ulam stability for functional equations in 2-normed spaces. We present and discuss them, pointing to the various pitfalls they contain and showing possible simple generalizations. In this way, in particular, we demonstrate that the easily noticeable symmetry between them and the analogous results obtained for the classical metric or normed spaces is in fact only apparent." @default.
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- W3213077971 date "2021-11-18" @default.
- W3213077971 modified "2023-10-18" @default.
- W3213077971 title "On Ulam Stability of Functional Equations in 2-Normed Spaces—A Survey" @default.
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- W3213077971 doi "https://doi.org/10.3390/sym13112200" @default.
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