Szczegóły publikacji
Opis bibliograficzny
On perturbations of two general equations in several variables / Krzysztof CIEPLIŃSKI // Mathematische Annalen ; ISSN 0025-5831. — 2023 — vol. 385 iss. 1–2, s. 921–937. — Bibliogr. s. 935–937, Abstr. — Publikacja dostępna online od: 2022-02-03
Autor
Dane bibliometryczne
| ID BaDAP | 145080 |
|---|---|
| Data dodania do BaDAP | 2023-02-22 |
| Tekst źródłowy | URL |
| DOI | 10.1007/s00208-022-02359-y |
| Rok publikacji | 2023 |
| Typ publikacji | artykuł w czasopiśmie |
| Otwarty dostęp |  |
| Creative Commons | |
| Czasopismo/seria | Mathematische Annalen |
Abstract
In this paper, we deal with perturbations of two general functional equations in several variables. Namely, we prove the generalized, in the spirit of Bourgin, Ulam stability of these equations in Banach spaces. In order to do this, we use the fixed point method. Moreover, as corollaries from our main results, we get several outcomes on approximate solutions of a few important classic equations. They include, among others, the functional equations which characterize multi-additive and multi-quadratic mappings. In consequence, the perturbation of homomorphisms of Banach spaces and quadratic mappings is also treated.