On closures in semitopological inverse semigroups with continuous inversion
We study the closures of subgroups, semilattices and different kinds of semigroup extensions in semitopological inverse semigroups with continuous inversion. In particularly we show that a topological group \(G\) is \(H\)-closed in the class of semitopological inverse semigroups with continuous inve...
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| Date: | 2018 |
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| Main Author: | |
| Format: | Article |
| Language: | English |
| Published: |
Lugansk National Taras Shevchenko University
2018
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| Subjects: | |
| Online Access: | https://admjournal.luguniv.edu.ua/index.php/adm/article/view/1047 |
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| Journal Title: | Algebra and Discrete Mathematics |
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Algebra and Discrete Mathematics| Summary: | We study the closures of subgroups, semilattices and different kinds of semigroup extensions in semitopological inverse semigroups with continuous inversion. In particularly we show that a topological group \(G\) is \(H\)-closed in the class of semitopological inverse semigroups with continuous inversion if and only if \(G\) is compact, a Hausdorff linearly ordered topological semilattice \(E\) is \(H\)-closed in the class of semitopological semilattices if and only if \(E\) is \(H\)-closed in the class of topological semilattices, and a topological Brandt \(\lambda^0\)-extension of \(S\) is (absolutely) \(H\)-closed in the class of semitopological inverse semigroups with continuous inversion if and only if so is \(S\). Also, we construct an example of an \(H\)-closed non-absolutely \(H\)-closed semitopological semilattice in the class of semitopological semilattices. |
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