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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 \lambdap:\betaG --> \betaG is defined by \lambdap(q)=pq, and \lambdap* denotes the restriction of \lambdap to G*. The talk is concerned with the points of continuity of \lambdap*.
Date received: June 6, 2001