Geodesic
The complexity of the set of squares in the homeomorphism group of the circle
Paul Gartside1 ; Bojana Pejić1
1 Department of Mathematics University of Pittsburgh 301 Thackeray Hall Pittsburgh, PA 15260, U.S.A.
Fundamenta Mathematicae, Tome 195 (2007) no. 2, pp. 125-134.

Voir la notice de l'article provenant de la source Institute of Mathematics Polish Academy of Sciences

The set of squares in the group of autohomeomorphisms of the circle is complete analytic, and hence analytic but not Borel.
DOI : 10.4064/fm195-2-2
Keywords: set squares group autohomeomorphisms circle complete analytic hence analytic borel

Paul Gartside 1 ; Bojana Pejić 1

1 Department of Mathematics University of Pittsburgh 301 Thackeray Hall Pittsburgh, PA 15260, U.S.A. 
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Paul Gartside; Bojana Pejić. The complexity of the set of squares in the
 homeomorphism group of the circle. Fundamenta Mathematicae, Tome 195 (2007) no. 2, pp. 125-134. doi : 10.4064/fm195-2-2. http://geodesic.mathdoc.fr/articles/10.4064/fm195-2-2/

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