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DTSTART:20240310T070000
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DTSTART:20241103T060000
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DTSTART;TZID=America/Toronto:20241128T140000
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URL:https://uwaterloo.ca/combinatorics-and-optimization/events/algebraic-an
 d-enumerative-combinatorics-seminar-mike
SUMMARY:Algebraic and enumerative combinatorics seminar-Mike Cummings
CLASS:PUBLIC
DESCRIPTION:TITLE:Combinatorial rules for the geometry of Hessenberg variet
 ies\n\nprogressions\n\nSpeaker\n Mike Cummings\n\nAffiliation\n University
  of Waterloo\n\nLocation\n MC 5479\n\n ABSTRACT: \n\nHessenberg varieties
  were introduced by De Mari\, Procesi\, and Shayman\nin the early 1990s an
 d lie at the intersection of geometry\,\nrepresentation theory\, and combi
 natorics.  In 2012\, Insko and Yong\nstudied a class of Hessenberg variet
 ies using patch ideals\, a\ntechnique dating back to at least the 1970s fr
 om the study of Schubert\nvarieties. In this talk\, we will derive patch i
 deals and use them to\nstudy two classes of Hessenberg varieties.  We wil
 l see the\ncombinatorics that govern the behaviour of these patch ideals a
 nd\ntranslate these results to the geometric setting. Based in part on\nwo
 rk with Sergio Da Silva\, Megumi Harada\, and Jenna Rajchgot.\n\nTHERE WIL
 L BE A PRE-SEMINAR PRESENTING RELEVANT BACKGROUND AT THE\nBEGINNING GRADUA
 TE LEVEL STARTING AT 1PM\,
DTSTAMP:20260403T083959Z
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