Regularity of the Semigroup of Regular Probability Measures on Locally Compact Hausdorff Topological Groups in which every element is of finite order

Abstract

Let G be a locally compact Hausdorff group in which every element is of finite order, and let P(G) denote the class of all regular probability measures on G. In this note, it is observed that a characterization of algebraically regular elements in certain subsemigroups of P(G) (Theorem 4.1 [11]) for compact G remains true for locally compact G. In addition, a complete description of algebraically regular elements in P(G) has been established when G is countable or uncountable where every proper subgroup is countable. In this case the standing assumption that every element is of finite order is not required. For compact Lie groups, Fourier transform techniques are also used to get more information on P(G). Several concrete examples are provided to illustrate the observations.

This article contains 9 pages, which is a revised version of the earlier one where the Fourier transform techniques was not included. The present one contains Fourier transform technique also and deals with more general groups as indicated in the abstract. This helps to deal with examples such as Johnson-type groups