Absolutely closed semigroups
General Topology
2023-01-09 v4 Group Theory
Abstract
Let be a class of topological semigroups. A semigroup is called - if for any homomorphism to a topological semigroup , the image is closed in . Let , , and be the classes of , Hausdorff, and Tychonoff zero-dimensional topological semigroups, respectively. We prove that a commutative semigroup is absolutely -closed if and only if is absolutely -closed if and only if is chain-finite, bounded, group-finite and Clifford+finite. On the other hand, a commutative semigroup is absolutely -closed if and only if is finite. Also, for a given absolutely -closed semigroup we detect absolutely -closed subsemigroups in the center of .
Cite
@article{arxiv.2207.12778,
title = {Absolutely closed semigroups},
author = {Taras Banakh and Serhii Bardyla},
journal= {arXiv preprint arXiv:2207.12778},
year = {2023}
}
Comments
22 pages