PSU Mark
Eberly College of Science Mathematics Department

Meeting Details

For more information about this meeting, contact Nigel Higson, Ping Xu, Mathieu Stienon.

Title:(Non) invertibility of C*-extensions
Seminar:GAP Seminar
Speaker:Jonas Seebach, Aarhus University
Abstract:
We briefly review the basics of C*-extensions as defined by Brown, Douglas and Fillmore and generalized by Kasparov. In particular we discuss the notion of invertibility of (equivalence classes of) extensions and quote a couple of wellknown results showing that not all extensions are invertible. We proceed to discuss the notion of asymptotically split extensions due to Thomsen and Manuilov and we demonstrate that in order to obtain a group from the semigroup of all unitary equivalence classes of extensions, it is generally necessary to trivialize the asymptotically split ones. Finally we quote a few recent results in this direction.

Room Reservation Information

Room Number:MB106
Date:11 / 02 / 2010
Time:02:30pm - 03:30pm