Ulam stability of a generalized harmonic functional equation using Brzdek's fixed point technique

Sayyari, Yamin; Dehghanian, Mehdi; Wang, Yongqiao; Park, Choonkil

doi:10.1007/s41478-025-00985-8

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Ulam stability of a generalized harmonic functional equation using Brzdek's fixed point technique

Sayyari, Yamin;
Dehghanian, Mehdi;
Wang, Yongqiao;
Park, Choonkil

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초록

Using Brzdek's fixed point technique, we investigate the Hyers-Ulam stability of the following functional equation: ah(axy/x+y) =h(x)+h(y) for all x,y is an element of R+, where a is a fixed positive real number.

키워드

Brzdek fixed point theorem; (Jensen) Harmonic functional equation; Stability; DERIVATIONS

제목: Ulam stability of a generalized harmonic functional equation using Brzdek's fixed point technique

저자: Sayyari, Yamin; Dehghanian, Mehdi; Wang, Yongqiao; Park, Choonkil

DOI: 10.1007/s41478-025-00985-8

발행일: 2026-04

유형: Article; Early Access

저널명: JOURNAL OF ANALYSIS

권: 34

호: 2

페이지: 1021 ~ 1041