About: Square principle

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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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  • 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. (en)
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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. (en)
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  • Square principle (en)
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