Title: | Hyperplanes in matroids and the axiom of choice (English) |
Author: | Morillon, Marianne |
Language: | English |
Journal: | Commentationes Mathematicae Universitatis Carolinae |
ISSN: | 0010-2628 (print) |
ISSN: | 1213-7243 (online) |
Volume: | 63 |
Issue: | 4 |
Year: | 2022 |
Pages: | 423-441 |
Summary lang: | English |
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Category: | math |
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Summary: | We show that in set theory without the axiom of choice ZF, the statement sH: ``Every proper closed subset of a finitary matroid is the intersection of hyperplanes including it'' implies AC$^{\rm fin}$, the axiom of choice for (nonempty) finite sets. We also provide an equivalent of the statement AC$^{\rm fin}$ in terms of ``graphic'' matroids. Several open questions stay open in ZF, for example: does sH imply the axiom of choice? (English) |
Keyword: | axiom of choice |
Keyword: | finitary matroid |
Keyword: | circuit |
Keyword: | hyperplane |
Keyword: | graph |
MSC: | 03E25 |
MSC: | 05B99 |
idZBL: | Zbl 07729552 |
idMR: | MR4577876 |
DOI: | 10.14712/1213-7243.2023.010 |
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Date available: | 2023-04-20T13:47:50Z |
Last updated: | 2023-10-27 |
Stable URL: | http://hdl.handle.net/10338.dmlcz/151644 |
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