Square principle
http://dbpedia.org/resource/Square_principle an entity of type: Agent
In mathematical set theory, a square principle is a combinatorial principle asserting the existence of a cohering sequence of short closed unbounded (club) sets so that no one (long) club set coheres with them all. As such they may be viewed as a kind ofincompactness phenomenon. They were introduced by Ronald Jensen in his analysis of the fine structure of the constructible universe L.
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Square principle
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2292730
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950478113
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In mathematical set theory, a square principle is a combinatorial principle asserting the existence of a cohering sequence of short closed unbounded (club) sets so that no one (long) club set coheres with them all. As such they may be viewed as a kind ofincompactness phenomenon. They were introduced by Ronald Jensen in his analysis of the fine structure of the constructible universe L.
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2528