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- W3103422578 abstract "Menger's basis property is a generalization of $sigma$-compactness and admits an elegant combinatorial interpretation. We introduce a general combinatorial method to construct non $sigma$-compact sets of reals with Menger's property. Special instances of these constructions give known counterexamples to conjectures of Menger and Hurewicz. We obtain the first explicit solution to the Hurewicz 1927 problem, that was previously solved by Chaber and Pol on a dichotomic basis. The constructed sets generate nontrivial subfields of the real line with strong combinatorial properties, and most of our results can be stated in a Ramsey-theoretic manner. Since we believe that this paper is of interest to a diverse mathematical audience, we have made a special effort to make it self-contained and accessible." @default.
- W3103422578 created "2020-11-23" @default.
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- W3103422578 date "2008-01-01" @default.
- W3103422578 modified "2023-09-23" @default.
- W3103422578 title "Scales, fields, and a problem of Hurewicz" @default.
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- W3103422578 doi "https://doi.org/10.4171/jems/132" @default.
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