Two types of approximate identities depending on the character spaces of Banach algebras
Year: 2015
Type: preprint
Abstract: Let $A$ be a commutative Banach algebra with non-empty character space $\Delta(A)$. In this paper, we give two notions of approximate identities for $A$. Indeed, we change the concepts of convergence and boundedness in the classical notion of bounded approximate identity. More precisely, a net $\{e_{\alpha}\}$ in $A$ is a c-w approximate identity if for each $a\in A$, the Gel'fand transform of $e_{\alpha}a$ tends to the Gel'fand transform of $a$ in the compact-open topology and we say $\{e_{\alpha}\}$ is weakly bounded if the image of $\{e_{\alpha}\}$ under the Gel'fand transform is bounded in $C_{0}(\Delta(A))$.
Source: arXiv (Cornell University)
Authors: Mohammad Fozouni, Raziyeh Farrokhzad
Language: English
Subfield: Mathematical Physics
Field: Mathematics
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W1610697002