2025 : 9 : 29
Amir Sahami

Amir Sahami

Academic rank: Associate Professor
ORCID:
Education: PhD.
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HIndex: 0/00
Faculty: Basic Science
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Research

Title
Module Johnson amenability of certain Banach algebras
Type
JournalPaper
Keywords
: Banach algebra, Module Johnson amenability, Matrix algebra, Semigroup algebra
Year
2021
Journal UPB Scientific Bulletin, Series A: Applied Mathematics and Physics
DOI
Researchers Amir Sahami ، Sayedeh Fatemeh Shariati ، Abdolrasoul Pourabbas

Abstract

In this paper, we introduce the new notion module Johnson amenabil-ity for a Banach algebra which is a Banach module over another Banach algebra with compatible actions. We study the relations between this new notion and other various notions of module amenability. We characterize the module Johnson amenability of ` 1 (S) as an ` 1 (E)-module, for an inverse semigroup S with subsemigroup E of idempotents. We investigate the module Johnson amenability of ` 1 (S), whenever S is a Brandt semigroup or bicyclic semigroup or N with maximum as its product. As application we show that for every non-empty set Λ, MΛ(C) as an A-module is module Johnson amenable if and only if Λ is finite, where A =  [ai,j ] ∈ MΛ(C) | ∀i =6 j, ai,j = 0 .