Selection principles and the minimal tower problem

Details Selection principles and the minimal tower problem Selection principles and the minimal tower problem

2001-05-06

arxiv.org/abs/math/0105045v6

Note di Matematica 22 (2003), 53--81

Mathematics

Logic

Small updates

Scientific paper

10.1285/i15900932v22n2p53

We study diagonalizations of covers using various selection principles, where the covers are related to linear quasiorderings (tau-covers). This includes: equivalences and nonequivalences, combinatorial characterizations, critical cardinalities and constructions of special sets of reals. This study leads to a solution of a topological problem which was suggested to the author by Scheepers (and stated in an earlier work) and is related to the Minimal Tower problem. We also introduce a variant of the notion of tau-cover, called tau^*-cover, and settle some problems for this variant which are still open in the case of $\tau$-covers. This new variant introduces new (and tighter) topological and combinatorial lower bounds on the Minimal Tower problem.

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