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 SM ISO690:2012ARHANGELISKI, Alexandr, CHOBAN, Mitrofan. Properties of remainders of topological groups and of their perfect images. In: Topology and its Applications, 2021, vol. 296, p. 0. ISSN 0166-8641. DOI: https://doi.org/10.1016/j.topol.2021.107687 |
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  Topology and its Applications |
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| Volumul 296 / 2021 / ISSN 0166-8641 | ||||||
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| DOI:https://doi.org/10.1016/j.topol.2021.107687 | ||||||
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If X is a dense subspace of a space B, then B is called an extension of X, and the subspace Y = B∖X is called a remainder of X. We study below, how the properties of remainders of spaces influence the properties of these spaces. In particular, we establish the following fact: if Y is a remainder of a topological group G in an extension B of G, and every closed pseudocompact Gδ-subspace of Y is compact, and B contains a nonempty compact subset Φ of countable character in B such that G∩Φ≠∅, then G is a paracompact p-space (Theorem 2.3). This fact plays a key role in the proofs of the similar statements for images and preimages of topological groups under perfect mappings (see Theorems 3.1, 3.2 and 3.4). |
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| Cuvinte-cheie Group extension, Group remainder, Metacompact, paracompact p-space, Perfect mapping, Point-finitely complete, Rajkov remainder, Topological group |
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