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Gδ Sets IN σ-IDEALS GENERATED BY COMPACT SETS

  • MAYA SARAN (a1)

Abstract

Given a compact Polish space E and the hyperspace of its compact subsets ${\cal K}\left( E \right)$ , we consider Gδσ-ideals of compact subsets of E. Solecki has shown that any σ-ideal in a broad natural class of Gδ ideals can be represented via a compact subset of ${\cal K}\left( E \right)$ ; in this article we examine the behaviour of Gδ subsets of E with respect to the representing set. Given an ideal I in this class, we construct a representing set that recognises a compact subset of E as being “small” precisely when it is in I, and recognises a Gδ subset of E as being “small” precisely when it is covered by countably many compact sets from I.

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