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SUMMARY:Stephanie van Willigenburg (University of British Columbia)
DTSTART:20210618T150000Z
DTEND:20210618T160000Z
DTSTAMP:20260423T021528Z
UID:ACPMS/1
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/ACPMS/1/">Th
 e e-positivity of chromatic symmetric functions</a>\nby Stephanie van Will
 igenburg (University of British Columbia) as part of Algebraic and Combina
 torial Perspectives in the Mathematical Sciences\n\n\nAbstract\nThe chroma
 tic polynomial was generalized to the chromatic symmetric function by Stan
 ley in his seminal 1995 paper. This function is currently experiencing a f
 lourishing renaissance\, in particular the study of the positivity of chro
 matic symmetric functions when expanded into the basis of elementary symme
 tric functions\, that is\, e-positivity.\nIn this talk we approach the que
 stion of e-positivity from various angles. Most pertinently we resolve the
  1995 statement of Stanley that no known graph exists that is not contract
 ible to the claw\, and whose chromatic symmetric function is not e-positiv
 e.\n\nThis is joint work with Soojin Cho\, Samantha Dahlberg\, Angele Fole
 y and Adrian She\, and no prior knowledge is assumed.\n\nPlease note that 
 this talk <b>starts at 17:00 (GMT+2)</b> instead of the usual time.\n
LOCATION:https://researchseminars.org/talk/ACPMS/1/
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