On the combinatorial properties of Blackwell spaces

Jasiński, Jakub

doi:10.1090/S0002-9939-1985-0776198-4

On the combinatorial properties of Blackwell spaces
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by Jakub Jasiński

Proc. Amer. Math. Soc. 93 (1985), 657-660

DOI: https://doi.org/10.1090/S0002-9939-1985-0776198-4

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Abstract:

Under ${\text {MA + }}\neg {\text {CH}}$ (Martin’s Axiom and negation of the Continuum Hypothesis) we prove that the intersection of a Blackwell space with the analytic set and the Cartesian product of a Blackwell space and a Borel set do not need to be Blackwell spaces.

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