## A note on Blackwell spaces.(English)Zbl 0568.28001

The authors show, using the Martin Axiom, a simple but witty example of a Blackwell space which is not strongly Blackwell. This solves a problem of K. P. S. Bhaskara Rao and B. V. Rao under $$MA_{\aleph_ 1}$$.
Reviewer: P.Holicky

### MSC:

 28A05 Classes of sets (Borel fields, $$\sigma$$-rings, etc.), measurable sets, Suslin sets, analytic sets 54H05 Descriptive set theory (topological aspects of Borel, analytic, projective, etc. sets) 03E50 Continuum hypothesis and Martin’s axiom 03E15 Descriptive set theory