Topological aspects of quasi *-algebras with sufficiently many *-representations

Abstract

Quasi *-algebras possessing a sufficient family mathcal {M} of invariant positive sesquilinear forms carry several topologies related to mathcal {M} which make every *-representation continuous. This leads to define the class of locally convex quasi GA*-algebras whose main feature consists in the fact that the family of their bounded elements, with respect to the family mathcal {M}, is a dense C*-algebra.