The complexity of the set of squares in the homeomorphism group of the circle
Paul Gartside ; Bojana Pejić
Fundamenta Mathematicae, Tome 193 (2007), p. 125-134 / Harvested from The Polish Digital Mathematics Library
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The set of squares in the group of autohomeomorphisms of the circle is complete analytic, and hence analytic but not Borel.

Publié le : 2007-01-01
EUDML-ID : urn:eudml:doc:283082 
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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 193 (2007) pp. 125-134. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-doi-10_4064-fm195-2-2/