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SUMMARY:Hyperbolic and elliptic commensurations - Mahan Mj (Tata Institute
  of Fundamental Research)
DTSTART:20251015T140000Z
DTEND:20251015T150000Z
UID:TALK238405@talks.cam.ac.uk
DESCRIPTION:A group G is said to commensurate a subgroup H\, if for all g 
 \\in G\, H^g \\cap H is of finite index in H and H^g\, where H^g denotes t
 he conjugate of H by g. The commensuration action of G on H can be studied
  dynamically. This gives rise&nbsp\; to two extreme behaviors: hyperbolic 
 and elliptic. We will discuss what these mean and survey a range of theore
 ms and conjectures in this context\, starting with work of Margulis\, and 
 coming to the&nbsp\;present&nbsp\;day.\n&nbsp\;
LOCATION:Seminar Room 2\, Newton Institute
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