Abstract

We study ideals I\mathcal{I} on N\mathbb{N} satisfying the following Baire-type property: if XX is a complete metric space and {XA ⁣:A∈I}\{X_{A} \colon A \in \mathcal{I} \} is a family of nowhere dense subsets of XX with XA⊂XBX_{A} \subset X_{B} whenever A⊂BA \subset B, then ⋃A∈IXA≠X\bigcup_{A \in \mathcal{I}}{X_{A}} \neq X. We give several characterizations and determine the ideals having this property among certain classes like analytic ideals and P-ideals. We also discuss similar covering properties when considering families of compact and meager subsets of XX.

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