Characterizing compact Clifford semigroups that embed into convolution and functor-semigroups

Details Characterizing compact Clifford semigroups that embed into convolution and functor-semigroups Characterizing compact Clifford semigroups that embed into convolution and functor-semigroups

2008-11-06

arxiv.org/abs/0811.1026v3

Semigroup Forum 83:1 (2011), 123-133

Mathematics

Group Theory

Scientific paper

10.1007/s00233-011-9319-5

We study algebraic and topological properties of the convolution semigroups of probability measures on a topological groups and show that a compact Clifford topological semigroup $S$ embeds into the convolution semigroup $P(G)$ over some topological group $G$ if and only if $S$ embeds into the semigroup $\exp(G)$ of compact subsets of $G$ if and only if $S$ is an inverse semigroup and has zero-dimensional maximal semilattice. We also show that such a Clifford semigroup $S$ embeds into the functor-semigroup $F(G)$ over a suitable compact topological group $G$ for each weakly normal monadic functor $F$ in the category of compacta such that $F(G)$ contains a $G$-invariant element (which is an analogue of the Haar measure on $G$).

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