Definability of small puncture sets

Andres Eduardo Caicedo,John D Clemens,Clinton T Conley,Benjamin D Miller

FUNDAMENTA MATHEMATICAE（2011）

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摘要

We characterize the class of definable families of countable sets for which there is a single countable definable set intersecting every element of the family.

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关键词

definability,dichotomy theorems,puncture sets

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