most recent 30 from http://mathoverflow.net 2013-05-21T18:43:03Z http://mathoverflow.net/feeds/user/23506 http://www.creativecommons.org/licenses/by-nc/2.5/rdf http://mathoverflow.net/questions/112373/anr-subsets-of-banach-spaces Nicolas Boerger 2012-11-14T10:41:12Z 2013-01-21T00:34:09Z

<p>I need a reference for conditions on a closed subspace of a Banach space to have the homotopy type of an ANR. </p>

http://mathoverflow.net/questions/108048/conjugacy-classes-of-elements-in-an-amalgam-of-finite-groups Nicolas Boerger 2012-09-25T12:16:14Z 2012-09-25T22:47:00Z

<p>Are there conditions on the finite groups $A$, $B$, $C$ or the morphisms $A \leftarrow C\rightarrow B$ that restrict the number of infinite conjugacy classes in the amalgamated product $A \overset{C}{*}B$? </p>

http://mathoverflow.net/questions/96191/operator-theoretical-models-for-k-mathbbz-3 Nicolas Boerger 2012-05-07T08:25:05Z 2012-05-08T16:29:58Z

<p>I am looking for a reference concerning operator theoretical Models of $K(\mathbb{Z},3)$. Stolz-Teichner briefly say in "what is an elliptic object" that a certain hyperfinite Type III-factor, called "local fermions on the circle" should be the right thing. Thanks </p>

http://mathoverflow.net/questions/96191/operator-theoretical-models-for-k-mathbbz-3/96278#96278 Nicolas Boerger 2012-05-08T07:23:58Z 2012-05-08T07:23:58Z

Thanks for the answer. What is the reference for the contractibility? Is there an operator theoretical model for the delooping too?