Hyperstability of the General Linear Functional Equation in Non-Archimedean Banach Spaces

IF 0.5 Q4 MATHEMATICS, INTERDISCIPLINARY APPLICATIONS P-Adic Numbers Ultrametric Analysis and Applications Pub Date : 2024-02-12 DOI:10.1134/s2070046624010060
Shujauddin Shuja, Ahmad F. Embong, Nor M. M. Ali
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Abstract

Let \( X \) be a normed space over \( \mathbb{F} \in\{ \mathbb{R}, \mathbb{C}\} \), \( Y \) be a non-Archimedean Banach space over a non-Archimedean non-trivial field \(\mathbb{K}\) and \(c,d,C,D\) be constants such that, \( c, d \in \mathbb{F}\setminus\{0\} \) and \( C, D \in \mathbb{K}\setminus\{0\} \). In this paper, some preliminaries on non-Archimedean Banach spaces and the concept of hyperstability are presented. Next, the well-known fixed point method [7, Theorem1] is reformulated in non-Archimedean Banach spaces. Using this method, we prove that the general linear functional equation \( h(cx+dy)= Ch(x)+Dh(y) \) is hyperstable in the class of functions \( h:X\rightarrow Y \). In fact, by exerting some natural assumptions on control function \( \gamma:X^{2}\setminus\{0\}\rightarrow \mathbb{R}_{+} \), we show that the map \( h:X\rightarrow Y \) that satisfies the inequality \( \lVert h(cx+dy)- Ch(x)-Dh(y)\rVert_{\ast}\leq \gamma(x,y) \), is a solution to general linear functional equation for every \( x, y \in X\setminus\{0\} \). Finally, this paper concludes with some consequences of the results.

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非阿基米德巴拿赫空间中一般线性函数方程的超稳定性
Abstract Let \( X \) be a normed space over \( \mathbb{F} \in\{ \mathbb{R}, \mathbb{C}\}), \( Y \) be a non-Archimedean Banach space over a non-Archimedean non-trivial field \(\mathbb{K}\) and \(c. d,C,D\) be constants such,\( c, d\in\mathbb{F}\setminus\{0\}) and\( C, D \in\mathbb{R}, \mathbb{C}\})、d,C,D)是常量,使得,(c, d 在 \mathbb{F}\setminus\{0\} 中)和(C, D 在 \mathbb{K}\setminus\{0\} 中)。本文首先介绍了非阿基米德巴拿赫空间和超稳定性概念。接下来,在非阿基米德巴拿赫空间中重新阐述了著名的定点法[7, Theorem1]。利用这种方法,我们证明了一般线性函数方程(h(cx+dy)= Ch(x)+Dh(y) )在函数类(h:X\rightarrow Y)中是超稳定的。事实上,通过对控制函数 (\gamma:X^{2}\setminus\{0\}\rightarrow \mathbb{R}_{+} \)施加一些自然假设,我们可以证明映射 (h:满足不等式(\lVert h(cx+dy)- Ch(x)-Dh(y)\rVert_{\ast}\leq \gamma(x,y) \)的映射(h: X\rightarrow Y \),对于 X\setminus\{0\} \中的每一个(x, y)都是一般线性函数方程的解。最后,本文总结了这些结果的一些后果。
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来源期刊
P-Adic Numbers Ultrametric Analysis and Applications
P-Adic Numbers Ultrametric Analysis and Applications MATHEMATICS, INTERDISCIPLINARY APPLICATIONS-
CiteScore
1.10
自引率
20.00%
发文量
16
期刊介绍: This is a new international interdisciplinary journal which contains original articles, short communications, and reviews on progress in various areas of pure and applied mathematics related with p-adic, adelic and ultrametric methods, including: mathematical physics, quantum theory, string theory, cosmology, nanoscience, life sciences; mathematical analysis, number theory, algebraic geometry, non-Archimedean and non-commutative geometry, theory of finite fields and rings, representation theory, functional analysis and graph theory; classical and quantum information, computer science, cryptography, image analysis, cognitive models, neural networks and bioinformatics; complex systems, dynamical systems, stochastic processes, hierarchy structures, modeling, control theory, economics and sociology; mesoscopic and nano systems, disordered and chaotic systems, spin glasses, macromolecules, molecular dynamics, biopolymers, genomics and biology; and other related fields.
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