Amenability and the second dual of a Banach algebra
Volume 125 / 1997
Studia Mathematica 125 (1997), 75-81 DOI: 10.4064/sm-125-1-75-81
Amenability and the Arens product are studied. Using the Arens product, derivations from A are extended to derivations from A**. This is used to show directly that A** amenable implies A amenable.