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Club degrees of rigidity and almost Kurepa trees

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Abstract

A highly rigid Souslin tree T is constructed such that forcing with T turns T into a Kurepa tree. Club versions of previously known degrees of rigidity are introduced, as follows: for a rigidity property P, a tree T is said to have property P on clubs if for every club set C (containing 0), the restriction of T to levels in C has property P. The relationships between these rigidity properties for Souslin trees are investigated, and some open questions are stated.

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Correspondence to Gunter Fuchs.

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The research for this work was supported by PSC CUNY grant 60048-40-41.

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Fuchs, G. Club degrees of rigidity and almost Kurepa trees. Arch. Math. Logic 52, 47–66 (2013). https://doi.org/10.1007/s00153-012-0306-7

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  • DOI: https://doi.org/10.1007/s00153-012-0306-7

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