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SUMMARY:Euler characteristics for complexes of graphs - Karen Vogtmann (Un
 iversity of Warwick)
DTSTART:20220225T134500Z
DTEND:20220225T144500Z
UID:TALK170624@talks.cam.ac.uk
CONTACT:76015
DESCRIPTION:Outer space is a space of graphs originally introduced as a to
 ol for studying the group of outer automorphisms of a free group. It gives
  rise to several chain complexes whose orbifold Euler characteristics can 
 be computed by graph-counting methods inspired by quantum field theory.  I
  will describe this\,  then outline recent results on the subtler question
  of determining the integral Euler characteristics of the quotient complex
 es.   This is joint work with M. Borinsky.
LOCATION:Zoom
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