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Martin's axioms, measurability and equiconsistency results

Published online by Cambridge University Press:  12 March 2014

Jaime I. Ihoda*
Affiliation:
Institute of Mathematics, The Hebrew University, Jerusalem, Israel
Saharon Shelah
Affiliation:
Institute of Mathematics, The Hebrew University, Jerusalem, Israel
*
Department of Mathematics, University of California, Berkeley, California 94720

Abstract

We deal with the consistency strength of ZFC + variants of MA + suitable sets of reals are measurable (and/or Baire, and/or Ramsey). We improve the theorem of Harrington and Shelah [2] repairing the asymmetry between measure and category, obtaining also the same result for Ramsey. We then prove parallel theorems with weaker versions of Martin's axiom (MA(σ-centered), (MA(σ-linked)), , MA(K)), getting Mahlo, inaccessible and weakly compact cardinals respectively. We prove that if there exists rR such that and MA holds, then there exists a -selective filter on ω, and from the consistency of ZFC we build a model for ZFC + MA(I) + every -set of reals is Lebesgue measurable, has the property of Baire and is Ramsey.

Type
Research Article
Copyright
Copyright © Association for Symbolic Logic 1989

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References

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