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DTSTART:20260308T070000
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DTSTART:20251102T060000
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DTSTART;TZID=America/Toronto:20260319T143000
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URL:https://uwaterloo.ca/combinatorics-and-optimization/events/algebraic-an
 d-enumerative-combinatorics-seminar-moriah-elkin
SUMMARY:Algebraic and enumerative combinatorics seminar - Moriah Elkin- Op
 en\nquiver loci\, CSM classes\, and chained generic pipe dreams
CLASS:PUBLIC
DESCRIPTION:SPEAKER:\n Moriah Elkin\n\nAFFILIATION:\n Cornell University\n\
 nLOCATION:\n MC 5417\n\nABSTRACT: In the space of type A quiver represent
 ations\, putting\nrank conditions on the maps cuts out subvarieties call
 ed \"open\nquiver loci.\" These subvarieties are closed under the group 
 action\nthat changes bases in the vector spaces\, so their closures defi
 ne\nclasses in equivariant cohomology\, called \"quiver polynomials.\"\nK
 nutson\, Miller\, and Shimozono found a pipe dream formula to compute\nth
 ese polynomials in 2006. To study the geometry of the open quiver\nloci t
 hemselves\, we might instead compute \"equivariant\nChern-Schwartz-MacPhe
 rson classes\,\" which interpolate between\ncohomology classes and Euler
  characteristic. I will introduce\nobjects called \"chained generic pipe
  dreams\" that allow us to compute\nthese CSM classes combinatorially\, a
 nd along the way give streamlined\nformulas for quiver polynomials.\n\nTH
 ERE WILL BE A PRE-SEMINAR PRESENTING RELEVANT BACKGROUND AT THE\nBEGINNIN
 G GRADUATE LEVEL STARTING AT 1:30PM.
DTSTAMP:20260409T053524Z
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