Ring isomorphisms in norm between Banach algebras of continuous complex-valued functions
Functional Analysis
2026-01-19 v1
Abstract
Let and be compact Hausdorff spaces, and let and denote the commutative Banach algebras of all continuous complex-valued functions on and , respectively. We study bijective maps from onto which preserve the ring structure in the norm in the following sense: Our main objective is to clarify whether such maps must necessarily be induced by homeomorphisms between the underlying spaces. Under the additional assumption that for , we prove that is a real-linear isometry. As a consequence, we obtain a concrete representation of such maps as weighted composition operators.
Cite
@article{arxiv.2601.11165,
title = {Ring isomorphisms in norm between Banach algebras of continuous complex-valued functions},
author = {T. Miura and T. Takahashi},
journal= {arXiv preprint arXiv:2601.11165},
year = {2026}
}