Mutually generic classes and incompatible expansions
Matt Kaufmann (1984)
Fundamenta Mathematicae
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Matt Kaufmann (1984)
Fundamenta Mathematicae
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Wojciech Guzicki (1974)
Fundamenta Mathematicae
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Heike Mildenberger (2005)
Acta Universitatis Carolinae. Mathematica et Physica
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Tim Carlson, Richard Laver (1989)
Fundamenta Mathematicae
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Uri Abraham, James Cummings (2012)
Open Mathematics
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We study polychromatic Ramsey theory with a focus on colourings of [ω 2]2. We show that in the absence of GCH there is a wide range of possibilities. In particular each of the following is consistent relative to the consistency of ZFC: (1) 2ω = ω 2 and for every α <ω 2; (2) 2ω = ω 2 and .
Andrzej Zarach (1973)
Fundamenta Mathematicae
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Vladimir Kanovei (1997)
Fundamenta Mathematicae
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A model is presented in which the equivalence relation xCy iff L[x]=L[y] of equiconstructibility of reals does not admit a reasonable form of the Glimm-Effros theorem. The model is a kind of iterated Sacks generic extension of the constructible model, but with an “ill“founded “length” of the iteration. In another model of this type, we get an example of a non-Glimm-Effros equivalence relation on reals. As a more elementary application of the technique of “ill“founded Sacks iterations,...