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TZID:Europe/Vienna
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DTSTART:20230326T030000
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BEGIN:VEVENT
DTSTAMP:20260425T044210Z
UID:1697713200@ist.ac.at
DTSTART:20231019T130000
DTEND:20231019T150000
DESCRIPTION:Speaker: Andrzej Weber\nhosted by Kamil Rychlewicz\nAbstract: W
 e compare the following three families of geometric objects: Schubert vari
 eties in flag manifolds\, matrix Schubert varieties and B-orbits of square
 -zero matrices. The first family is governed by permutations\, the second 
 by partial permutations and the last one by "patterns".  Schubert varieti
 es admit  certain characteristic classes in equivariant elliptic cohomolo
 gy obtained within the framework created by Borisov and Libgober. Elliptic
  characteristic classes satisfy Okounkov axioms of stable envelopes. We co
 nsider the Hecke-type algebra computing elliptic classes and extend its a
 ction to partial permutations and patterns. An uniform point of view allow
 s to understand duality better. 
LOCATION:Heinzel Seminar Room (I21.EG.101)\, Office Building West\, ISTA\, 
 ISTA
ORGANIZER:birgit.oosthuizen-noczil@ist.ac.at 
SUMMARY:Andrzej Weber: Elliptic Characteristic classes o matrix Schubert va
 rieties:  patterns and algebra
URL:https://talks-calendar.ista.ac.at/events/4477
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