On invariant CCC -ideals
Jan Kraszewski (2005)
Acta Universitatis Carolinae. Mathematica et Physica
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Displaying similar documents to “Around cofin”
On invariant CCC -ideals
On saturated ideals and
C. Johnson (1988)
Fundamenta Mathematicae
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On families of σ-complete ideals
Adam Krawczyk, Andrzej Pelc (1980)
Fundamenta Mathematicae
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On saturated sets of ideals and Ulam's problem
Alan Taylor (1980)
Fundamenta Mathematicae
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Generalized Luzin sets
Lev Bukovský (2010)
Acta Universitatis Carolinae. Mathematica et Physica
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The structure of precipitous ideals
Stanley Wagon (1980)
Fundamenta Mathematicae
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A saturation property on ideals
Richard Laver (1978)
Compositio Mathematica
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Borel Tukey morphisms and combinatorial cardinal invariants of the continuum
Samuel Coskey, Tamás Mátrai, Juris Steprāns (2013)
Fundamenta Mathematicae
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We discuss the Borel Tukey ordering on cardinal invariants of the continuum. We observe that this ordering makes sense for a larger class of cardinals than has previously been considered. We then provide a Borel version of a large portion of van Douwen's diagram. For instance, although the usual proof of the inequality 𝔭 ≤ 𝔟 does not provide a Borel Tukey map, we show that in fact there is one. Afterwards, we revisit a result of Mildenberger concerning a generalization of the unsplitting...