<div class="gmail_extra"><div class="gmail_quote"><div class="gmail_quote"><br> BINGHAMTON GEOMETRY/TOPOLOGY SEMINAR<br><br>This week, we will have a lecturer in our <b>Dean's Speaker Series in Geometry and Topology</b>, Francis Bonahon of University of Southern California.<br>
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<br><i>Date:</i> Thursday, May 3, 2012<br>
<i>Time:</i> 2:50-3:50pm<br><i>Place:</i> Library North 2205 followed by coffee/tea in the Anderson Reading Room.<br>
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<i>Speaker:</i> Francis Bonahon (University of Southern California)<br><i>Title:</i> Character varieties of surfaces and Kauffman brackets<i><br><br>Abstract:</i> My talk will involve two concepts which are apparently very
different. The character variety of a surface S, consisting of
homomorphisms from the fundamental group of S to a Lie group G, arises in
many different branches of mathematics. The classical Kauffman bracket is
an invariant of knots and links in space, closely related to the Jones
polynomial. When G = SL<sub>2</sub>(C), Turaev showed that the character variety can
be quantised by a generalisation of Kauffman brackets to the surface S. I
will discuss the classification problem for Kauffman brackets on S, with
results, conjectures and interesting examples.
10 May </div></div></div>