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DTSTART;TZID=America/Los_Angeles:20260428T121500
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DTSTAMP:20260427T175441
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SUMMARY:Coordinate ring of the universal centralizer via Demazure operators (Tom Gannon\, UCR)
DESCRIPTION:One of the key objects used in Ngo’s proof of the fundamental lemma is the group scheme of universal centralizers associated to a split reductive group G. In this talk\, we’ll discuss forthcoming work\, joint with Victor Ginzburg\, which describes the coordinate ring of the group scheme of universal centralizers in terms of the root datum of G using Demazure (or divided difference) operators. We will then discuss how our result follows from a more general computation on Weil restriction and\, time permitting\, we will discuss a potential generalization of our result to Coulomb branches.
URL:https://colleges.claremont.edu/ccms/event/antc-talk-tom-gannon-ucr/
LOCATION:Estella 2099
CATEGORIES:Algebra / Number Theory / Combinatorics Seminar
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DTSTART;TZID=America/Los_Angeles:20260505T121500
DTEND;TZID=America/Los_Angeles:20260505T131000
DTSTAMP:20260427T175441
CREATED:20260119T224840Z
LAST-MODIFIED:20260427T163251Z
UID:3962-1777983300-1777986600@colleges.claremont.edu
SUMMARY:Voting on relations using pairs information (Michael Orrison\, HMC)
DESCRIPTION:Many aggregation problems ask us to turn individual judgments into a single collective outcome. In this talk\, we model each voter’s input as a relation on a set of alternatives\, allowing pairwise comparisons to include strict preferences\, ties\, or incomparability. This perspective gives a common framework for median procedures and scoring methods\, including several familiar voting rules. The distance-based side leads naturally to graphs such as the hypercube of relations\, while the scoring-based side leads to questions about linear operators on functions on relations. At the center is a natural four-parameter family of scoring matrices whose eigenspace decompositions separate meaningful types of pairwise information\, connecting voting theory with graph theory\, linear algebra\, and harmonic analysis. \nThis is joint work with Karl-Dieter Crisman\, Erin McNicholas\, and Kathryn Nyman.
URL:https://colleges.claremont.edu/ccms/event/antc-talk-michael-orrison-hmc/
LOCATION:Estella 2099
CATEGORIES:Algebra / Number Theory / Combinatorics Seminar
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DTSTART;TZID=America/Los_Angeles:20260908T121500
DTEND;TZID=America/Los_Angeles:20260908T131000
DTSTAMP:20260427T175441
CREATED:20260417T223051Z
LAST-MODIFIED:20260417T223051Z
UID:4081-1788869700-1788873000@colleges.claremont.edu
SUMMARY:ANTC talk -- Michelle Manes (American Institute of Mathematics)
DESCRIPTION:
URL:https://colleges.claremont.edu/ccms/event/antc-talk-michelle-manes-american-institute-of-mathematics/
LOCATION:TBA
CATEGORIES:Algebra / Number Theory / Combinatorics Seminar
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