Scales, fields, and a problem of Hurewicz
By Boaz Tsaban, Lubomyr Zdomsky. 2005
72 citations recorded by the source corpus.
Menger's basis property is a generalization of $\sigma$-comp\-actness 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.
Subfields: Computational Theory and Mathematics, Discrete Mathematics and Combinatorics, Geometry and Topology
View Paper: https://www.semanticscholar.org/paper/cc350b62303b2b1ffff5978716da7d3fb8949e0a
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In Computational Theory and Mathematics
In Discrete Mathematics and Combinatorics
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Citations in the corpus
- MENGER'S AND HUREWICZ'S PROBLEMS: SOLUTIONS FROM "THE BOOK" AND REFINEMENTS (2009, background): “Let d denote the minimal cardinality of a dominating subset of [N]∞.”