English

$G_{\delta}$ sets in $\sigma$-ideals generated by compact sets

Logic 2019-02-26 v2

Abstract

Given a compact Polish space EE and the hyperspace of its compact subsets K(E)\mathcal{K}(E), we consider the class of GδG_{\delta} σ\sigma-ideals of compact subsets of EE that can be represented via a compact subset of K(E)\mathcal{K}(E). If we extend such an ideal II by considering GδG_{\delta} (or analytic) sets that are covered by countable unions of sets in II, we show that the extended collection can still be represented via some compact subset of K(E)\mathcal{K}(E).

Keywords

Cite

@article{arxiv.1807.00845,
  title  = {$G_{\delta}$ sets in $\sigma$-ideals generated by compact sets},
  author = {Maya Saran},
  journal= {arXiv preprint arXiv:1807.00845},
  year   = {2019}
}

Comments

New version (Feb 23, 2019) has corrected typos and minor changes to arguments. Results unchanged

R2 v1 2026-06-23T02:48:36.202Z