Squares with diamonds and Souslin trees with special squares
Uri Abraham, Saharon Shelah, R. Solovay (1987)
Fundamenta Mathematicae
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Uri Abraham, Saharon Shelah, R. Solovay (1987)
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Mirna Džamonja (2001)
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Alonzo Church, S. Kleene (1937)
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We investigate σ-entangled linear orders and narrowness of Boolean algebras. We show existence of σ-entangled linear orders in many cardinals, and we build Boolean algebras with neither large chains nor large pies. We study the behavior of these notions in ultraproducts.
Arthur Apter, James Henle (1991)
Fundamenta Mathematicae
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