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SUMMARY:Non-arithmetic lattices - John Parker (University of Durham)
DTSTART:20170425T100000Z
DTEND:20170425T110000Z
UID:TALK72223@talks.cam.ac.uk
CONTACT:INI IT
DESCRIPTION:In 1980 Mostow found the first examples of non-arithmetic latt
 ices in PU(2\,1). More examples were found and Deligne and Mostow gave a l
 ist of examples in 1986. Work of McMullen\, based on work of Kappes and Mo
 eller\, showed there are 9 commensurability classes of non-arithmeticlatti
 ces in PU(2\,1) on this list. No new examples were found until my recent w
 ork with Deraux and Paupert. We have constructed 13 new commensurability c
 lasses. I will give a history of this problem and then outline our recent 
 results.<br><br><br><br>
LOCATION:Seminar Room 2\, Newton Institute
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