The higher duals of certain class of Banach algebras

Abstract

Given a Banach space $A$ and fix a non-zero $\varphi\in A^*$ with $\|\varphi\|\leq 1$. Then the product $a\cdot b=\langle\varphi, a\rangle\ b$ turning $A$ into a Banach algebra which will be denoted by $_\varphi A.$ Some of the main properties of $_\varphi A$ such as Arens regularity, $n$-weak amenability and semi-simplicity are investigated.