Continuity in G^*
by
I. Protasov
University of Kiev

Let G be a countable discrete group and let \betaG be its Stone-Cech compactification. Identify G with the subset of principal ultrafilters, denote \betaG\G by G^* and consider \betaG as a compact right topological semigroup. For every p in \betaG, the mapping \lambda_p:\betaG --> \betaG is defined by \lambda_p(q)=pq, and \lambda_p^* denotes the restriction of \lambda_p to G^*. The talk is concerned with the points of continuity of \lambda_p^*.

Date received: June 6, 2001