• A GHAFFARI

      Articles written in Proceedings – Mathematical Sciences

    • Involutions and trivolutions on second dual of algebras related to locally compact groups and topological semigroups

      A ALINEJAD A GHAFFARI

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      We investigate involutions and trivolutions in the second dual of algebras related to a locally compact topological semigroup and the Fourier algebra of a locally compact group. We prove, among the other things, that for a large class of topological semigroups namely, compactly cancellative foundation $\ast$-semigroup $S$ when it is infinite non-discrete cancellative, $M_{a}(S)^{\ast\ast}$ does not admit an involution, and $M_{a}(S)^{\ast\ast}$ has atrivolution with range $M_{a}(S)$ if and only if $S$ is discrete. We also show that when $G$ isan amenable group, the second dual of the Fourier algebra of $G$ admits an involutionextending one of the natural involutions of $A(G)$ if and only if $G$ is finite. However,$A(G)^{\ast\ast}$ always admits trivolution.

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