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SUMMARY:The magnitude of an enriched category - Tom Leinster\, University 
 of Glasgow
DTSTART:20110614T131500Z
DTEND:20110614T141500Z
UID:TALK31774@talks.cam.ac.uk
CONTACT:Nathan Bowler
DESCRIPTION:There is a close but underexploited analogy between the Euler 
 characteristic of a topological space and the cardinality of a set. Taking
  this as inspiration\, I will give a definition of the "magnitude" of an e
 nriched category.  From this single definition can be derived many cardina
 lity-like invariants (some old\, some new): the Euler characteristic of a 
 manifold or orbifold\, the Euler characteristic of a category\, the magnit
 ude of a metric space\, the Euler characteristic of a Koszul algebra\, and
  more.  I will give an overview.  For an informal preview and discussion\,
  see\n\nhttp://golem.ph.utexas.edu/category/2011/06/the_magnitude_of_an_en
 riched_c.html
LOCATION:MR3\, Centre for Mathematical Sciences
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