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DTSTART:20260308T070000
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DTSTART:20251102T060000
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DTSTART;TZID=America/Toronto:20260625T143000
SEQUENCE:0
TRANSP:TRANSPARENT
DTEND;TZID=America/Toronto:20260625T153000
URL:https://uwaterloo.ca/combinatorics-and-optimization/events/algebraic-an
 d-enumerative-combinatorics-seminar-mike-0
SUMMARY:Algebraic and Enumerative combinatorics seminar -Mike Cummings-Webs
 \nand smooth components of two column Springer fibers
CLASS:PUBLIC
DESCRIPTION:SPEAKER:\n Mike Cummings\n\nAFFILIATION:\n University of Waterl
 oo\n\nLOCATION:\n MC 6460\n\nABSTRACT:  When you encounter an algebraic 
 variety in the wild\, you\nmight ask: What do its components look like? Wh
 ich components are\nsmooth? How do the components intersect? For Springer 
 fibres\, answers\nto these questions are only known in some very special c
 ases. This is\nparticularly surprising because other aspects Springer fibr
 es have\nbeen studied for the past 50 years and they appear throughout\nco
 mbinatorics and adjacent areas. For just one example:\nHall–Littlewood p
 olynomials can be obtained from the cohomology of\nSpringer fibres by taki
 ng graded Frobenius characteristic.\n\nOne classical theorem says that the
  components of Springer fibers are\nindexed by standard Young tableaux. In
  this talk\, we will discuss the\nbenefits of instead using webs to index 
 the components in two cases:\nthe \"two row\" case\, and our recent contri
 butions in the \"two column\"\ncase. We will see that in these cases\, web
 s both characterize and\ndescribe the smooth components of Springer fibres
 \, and give a\ngeometric interpretation of rotation of webs.\n\nTHERE WILL
  BE A PRE-SEMINAR PRESENTING RELEVANT BACKGROUND AT\nBEGINNING GRADUATE LE
 VEL STARTING AT 1:30PM IN MC 5417.
DTSTAMP:20260616T102743Z
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