Ideals on countable sets: a survey with questions
classification
🧮 math.LO
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idealscountablequestionssetssubsetssurveybeenclosed
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An ideal on a set $X$ is a collection of subsets of $X$ closed under the operations of taking finite unions and subsets of its elements. Ideals are a very useful notion in topology and set theory and have been studied for a long time. We present a survey of results about ideals on countable sets and include many open questions.
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