HAPPY AND MAD FAMILIES INL(ℝ)

Author:

NEEMAN ITAY,NORWOOD ZACH

Abstract

AbstractWe prove that, in the choiceless Solovay model, every set of reals isH-Ramsey for every happy familyHthat also belongs to the Solovay model. This gives a new proof of Törnquist’s recent theorem that there are no infinite mad families in the Solovay model. We also investigate happy families and mad families under determinacy, applying a generic absoluteness result to prove that there are no infinite mad families under$A{D^ + }$.

Publisher

Cambridge University Press (CUP)

Subject

Logic,Philosophy

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