School of Mathematical Sciences, Qufu Normal University, Qufu 273165, China
Abstract:
We introduce and study property T and strong property T for unital *-homomorphisms between two unital C*-algebras. We also consider the relations between property T and invariant subspaces for some canonical unital *-representations. As a corollary, we show that when G is a discrete group, G is nite if and only if G is amenable and the inclusion map i : has property T: We also give some new equivalent forms of property T for countable discrete groups and strong property T for unital C*-algebras.