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Media type:
E-Article
Title:
On the Concept of π1 1-Completeness
Contributor:
Kechris, Alexander S.
Published:
American Mathematical Society, 1997
Published in:
Proceedings of the American Mathematical Society, 125 (1997) 6, Seite 1811-1814
Language:
English
ISSN:
0002-9939;
1088-6826
Origination:
Footnote:
Description:
It is shown that two natural notions of completeness for co-analytic sets in Polish spaces, one in terms of continuous reductions and the other in terms of Borel reductions, coincide. The proof uses methods of effective descriptive set theory.