Stability of the Fréchet Equation in Quasi-Banach Spaces

Autor: Sang Og Kim
Jazyk: angličtina
Rok vydání: 2020
Předmět:
Zdroj: Mathematics, Vol 8, Iss 4, p 490 (2020)
Druh dokumentu: article
ISSN: 2227-7390
DOI: 10.3390/math8040490
Popis: We investigate the Hyers–Ulam stability of the well-known Fréchet functional equation that comes from a characterization of inner product spaces. We also show its hyperstability on a restricted domain. We work in the framework of quasi-Banach spaces. In the proof, a fixed point theorem due to Dung and Hang, which is an extension of a fixed point theorem in Banach spaces, plays a main role.
Databáze: Directory of Open Access Journals
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