Separating club-guessing principles in the presence of fat forcing axioms
We separate various weak forms of Club Guessing at ω1 in the presence of 2ℵ0 large, Martin's Axiom, and related forcing axioms. We also answer a question of Abraham and Cummings concerning the consistency of the failure of a certain polychromatic Ramsey statement together with the continuum lar...
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Published in | Annals of pure and applied logic Vol. 167; no. 3; pp. 284 - 308 |
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Main Authors | , |
Format | Journal Article |
Language | English |
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Elsevier B.V
01.03.2016
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Abstract | We separate various weak forms of Club Guessing at ω1 in the presence of 2ℵ0 large, Martin's Axiom, and related forcing axioms.
We also answer a question of Abraham and Cummings concerning the consistency of the failure of a certain polychromatic Ramsey statement together with the continuum large.
All these models are generic extensions via finite support iterations with symmetric systems of structures as side conditions, possibly enhanced with ω-sequences of predicates, and in which the iterands are taken from a relatively small class of forcing notions.
We also prove that the natural forcing for adding a large symmetric system of structures (the first member in all our iterations) adds ℵ1-many reals but preserves CH. |
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AbstractList | We separate various weak forms of Club Guessing at ω1 in the presence of 2ℵ0 large, Martin's Axiom, and related forcing axioms.
We also answer a question of Abraham and Cummings concerning the consistency of the failure of a certain polychromatic Ramsey statement together with the continuum large.
All these models are generic extensions via finite support iterations with symmetric systems of structures as side conditions, possibly enhanced with ω-sequences of predicates, and in which the iterands are taken from a relatively small class of forcing notions.
We also prove that the natural forcing for adding a large symmetric system of structures (the first member in all our iterations) adds ℵ1-many reals but preserves CH. |
Author | Mota, Miguel Angel Asperó, David |
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Cites_doi | 10.1016/j.apal.2008.07.006 10.1007/BF02803525 10.1007/s11856-015-1250-0 10.2178/jsl/1333566635 10.1016/j.apal.2014.12.001 10.2307/2000309 10.2178/jsl/1191333845 10.4310/MRL.1998.v5.n2.a8 10.1090/S0002-9947-2015-06205-9 10.2478/s11533-012-0037-3 |
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Snippet | We separate various weak forms of Club Guessing at ω1 in the presence of 2ℵ0 large, Martin's Axiom, and related forcing axioms.
We also answer a question of... |
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SubjectTerms | Club-guessing principles Iterated forcing Polychromatic Ramsey theory Side conditions |
Title | Separating club-guessing principles in the presence of fat forcing axioms |
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