%0 Journal Article
%T Hurewicz-like tests for Borel subsets of the plane
%A Dominique Lecomte
%J Mathematics
%D 2007
%I arXiv
%X Let xi be a non-null countable ordinal. We study the Borel subsets of the plane that can be made $\bormxi$ by refining the Polish topology on the real line. These sets are called potentially $\bormxi$. We give a Hurewicz-like test to recognize potentially $\bormxi$ sets.
%U http://arxiv.org/abs/0710.0154v1