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UID:20260306T091831EST-9401VM3kgu@132.216.98.100
DTSTAMP:20260306T141831Z
DESCRIPTION:Title: A positive combinatorial rule for psi class products on 
 multicolored spaces\n\nAbstract: It is well known that a product of psi cl
 asses on the moduli space M_{0\,n}-bar\, the most commonly studied compact
 ification of the moduli space M_{0\,n} of choices of n distinct marked poi
 nts on P^1\, is equal to a multinomial coefficient and has many natural co
 mbinatorial interpretations. However\, simple positive combinatorial formu
 las are more elusive for other natural compactifications of M_{0\,n}\, inc
 luding Hassett spaces in which the points are 'weighted'\, in addition to 
 the 'multicolored' setting in which the marked points are assigned colors.
  We demonstrate\, in the case of multicolored spaces\, how an alternating 
 sum formula can be simplified to a positive combinatorial rule via a sign-
 reversing involution\, and discuss some applications of the formula.\n\nLo
 cation: UQAM PK-5675\n\n \n
DTSTART:20260225T190000Z
DTEND:20260225T200000Z
SUMMARY:Maria Gillespie (Colorado State University)
URL:/mathstat/channels/event/maria-gillespie-colorado-
 state-university-371433
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