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DTSTART:20220327T030000
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BEGIN:VEVENT
DTSTAMP:20260406T121845Z
UID:1639054800@ist.ac.at
DTSTART:20211209T140000
DTEND:20211209T160000
DESCRIPTION:Speaker: Andrzej Weber\nhosted by Tamas Hausel\nAbstract: We mo
 dify the theory of Borisov and Libgober to define equivariant characterist
 ic classes of Schubert varieties in the generalized flag varieties G/B. Th
 e resulting classes can be considered as functions depending on two sets o
 f parameters: equivariant variables and Kaehler variables. There are two r
 ecursions which allow to compute inductively these classes: right recursio
 n corresponding to geometric Demazure-Lusztig operation and left recursion
  induced by the R-matrix appearing in Yang-Baxter equation. When one passe
 s from a group G to its Langlands' dual the recursions switch they roles. 
 This allows to show that equivariant elliptic classes for Langlands dual g
 roups coincide after a swap of equivariant variables with Kaehler variable
 s. This duality is only on the numerical level. The geometric cause remain
 s mysterious.
LOCATION:https://mathseminars.org/seminar/AGNTISTA\, ISTA
ORGANIZER:birgit.oosthuizen-noczil@ist.ac.at
SUMMARY:Andrzej Weber: Elliptic characteristic classes of Schubert varietie
 s and duality
URL:https://talks-calendar.ista.ac.at/events/3307
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