Mathematics – General Topology
Scientific paper
2008-07-19
Acta Math. Hungarica 124:3 (2009), 201-214
Mathematics
General Topology
Scientific paper
10.1007/s10474-009-8144-8
In this paper we search for conditions on a countably compact (pseudo-compact) topological semigroup under which: (i) each maximal subgroup $H(e)$ in $S$ is a (closed) topological subgroup in $S$; (ii) the Clifford part $H(S)$(i.e. the union of all maximal subgroups) of the semigroup $S$ is a closed subset in $S$; (iii) the inversion $\operatorname{inv}\colon H(S)\to H(S)$ is continuous; and (iv) the projection $\pi\colon H(S)\to E(S)$, $\pi\colon x\longmapsto xx^{-1}$, onto the subset of idempotents $E(S)$ of $S$, is continuous.
Gutik Oleg V.
Pagon Dušan
Repovš Dušan
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