From: raziye1361 <raziye1361@...>
Subject: [harmonic] question
To: harmonicanalysis@yahoogroups.com
Date: Monday, 13 October, 2008, 4:55 PM

Dear members
please help me with the proof of this theorem
Let S be a semigroup such that $l^(s)$ is amenable. then
$|E(S)|^(1/2) \leq AM(l^(s))$
if the idempotents of S commute, then
$|E(S)|\leq AM(l^(s))$
definition:
let A be amenable Banach algebra we set
AM(A)=inf{C> 0 :A is C-amenable}