Bulletin of the Iranian Mathematical Society

Bulletin of the Iranian Mathematical Society

Banach module valued separating maps and automatic continuity

Document Type : Research Paper

Authors
Abstract
For two algebras $A$ and $B$, a linear map $T:A longrightarrow
B$ is called separating, if $xcdot y=0$ implies $Txcdot Ty=0$ for
all $x,yin A$. The general form and the automatic continuity of
separating maps between various Banach algebras have been studied
extensively. In this paper, we first extend the notion of separating
map for module case and then we give a description of a linear
separating map $T:B longrightarrow X$, where $B$ is a unital
commutative semisimple regular Banach algebra satisfying the
Ditkin's condition and $X$ is a left Banach module over a unital
commutative Banach algebra. We also show that if $X$ is hyper
semisimple and $T$ is bijective, then $T$ is automatically
continuous and $T^{-1}$ is separating as well.
Keywords

Volume 37, No. 4
December 2011
Pages 127-139

  • Receive Date 08 April 2010
  • Revise Date 03 June 2010
  • Accept Date 03 June 2010