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Separating Many Localisation Cardinals on the Generalised Baire Space

Logic 2025-03-19 v1

Abstract

Given a cofinal cardinal function hκκh\in{}^\kappa\kappa for κ\kappa inaccessible, we consider the dominating hh-localisation number, that is, the least cardinality of a dominating set of hh-slaloms such that every κ\kappa-real is localised by a slalom in the dominating set. It was proved in arXiv:1611.08140 that the dominating localisation numbers can be consistently different for two functions hh (the identity function and the power function). We will construct a κ\kappa-sized family of functions hh and their corresponding localisation numbers, and use a κ{\leq}\kappa-supported product of a cofinality-preserving forcing to prove that any simultaneous assignment of these localisation numbers to cardinals above κ\kappa is consistent. This answers an open question from arXiv:1611.08140 .

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Cite

@article{arxiv.2203.03256,
  title  = {Separating Many Localisation Cardinals on the Generalised Baire Space},
  author = {Tristan van der Vlugt},
  journal= {arXiv preprint arXiv:2203.03256},
  year   = {2025}
}

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11 pages