Countable Tightness Is Not Discretely Reflexive in σ-Compact Spaces
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| Publication date | 04-2025 |
| Journal | Acta mathematica Hungarica |
| Volume | Issue number | 175 | 2 |
| Pages (from-to) | 543-549 |
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| Abstract | Answering a question raised by V.V. Tkachuk in [10], we present several examples of σ-compact spaces, some only consistent and some in ZFC, that are not countably tight but in which the closure of any discrete subset is countably tight. In fact, in some of our examples the closures of all discrete subsets are even first countable. |
| Document type | Article |
| Language | English |
| Published at | https://doi.org/10.1007/s10474-025-01521-7 |
| Other links | https://www.scopus.com/pages/publications/105001479170 |
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Countable Tightness Is Not Discretely Reflexive in σ-Compact Spaces
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