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DTSTART:20070311T020000
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BEGIN:VEVENT
DTSTAMP:20261019T150024
DTSTART;TZID=America/Detroit:20261023T150000
DTEND;TZID=America/Detroit:20261023T160000
SUMMARY:Workshop / Seminar:Unexpected torus action on toric Richardson varieties
DESCRIPTION:This talk focuses on Richardson varieties in the complete flag variety\, which are intersections of a Schubert variety with an opposite Schubert variety. Richardson varieties are indexed by intervals in the Bruhat order on the symmetric group. In joint work with E. Gorsky and M. Sherman-Bennett\, we study the following question: when is a Richardson variety a toric variety? All Richardson varieties admit an action by an (n-1)- dimensional torus in SL_n\, called the standard torus\, which also acts on the complete flag variety. The Richardson varieties which are toric varieties with respect to the standard torus were classified independently by Anderson and Tsukerman--Williams. We found that there are many additional toric Richardson varieties\, which we call \"unexpected”. In this rather expository talk\, I will classify toric Richardson varieties using the combinatorics of Bruhat intervals and focus on describing this \"unexpected\" torus action using the Marsh--Rietsch parametrization on open Richardson varieties. If time permits\, I will mention my ongoing research in this direction.
UID:149981-21907760@events.umich.edu
URL:https://events.umich.edu/event/149981
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Mathematics
LOCATION:East Hall - 4088
CONTACT:
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BEGIN:VEVENT
DTSTAMP:20261019T152959
DTSTART;TZID=America/Detroit:20261030T150000
DTEND;TZID=America/Detroit:20261030T160000
SUMMARY:Workshop / Seminar:Zamolodchikov Periodic Cluster Algebras
DESCRIPTION:In 2007\, Fomin and Zelevinsky introduced the bipartite belt\, a sequence of bipartite cluster mutations whose exchange relations form a discrete dynamical system. When the system is periodic\, we call this Zamolodchikov periodicity. In this talk\, we discuss the classification of all Zamolodchikov periodic cluster algebras\, with connections to W-graphs\, root systems\, and maximal green sequences. We observe that there is a natural red-blue statistic on the associated tropical dynamics that is homomesic\, and use laminations to prove it for finite type. This gives a natural bijection between colored mutations in the dynamical system and roots in the associated root system.
UID:149993-21907789@events.umich.edu
URL:https://events.umich.edu/event/149993
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Mathematics
LOCATION:East Hall - 4088
CONTACT:
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20260812T081935
DTSTART;TZID=America/Detroit:20261106T150000
DTEND;TZID=America/Detroit:20261106T160000
SUMMARY:Workshop / Seminar:Combinatorics Seminar
DESCRIPTION:TBD
UID:150159-21908304@events.umich.edu
URL:https://events.umich.edu/event/150159
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Mathematics
LOCATION:East Hall - 4088
CONTACT:
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20260926T172212
DTSTART;TZID=America/Detroit:20261113T150000
DTEND;TZID=America/Detroit:20261113T160000
SUMMARY:Workshop / Seminar:Combinatorics Seminar
DESCRIPTION:TBA
UID:149671-21906924@events.umich.edu
URL:https://events.umich.edu/event/149671
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Mathematics
LOCATION:East Hall - 4088
CONTACT:
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20260812T122132
DTSTART;TZID=America/Detroit:20261120T150000
DTEND;TZID=America/Detroit:20261120T160000
SUMMARY:Workshop / Seminar:Combinatorics Seminar
DESCRIPTION:TBD
UID:150177-21908328@events.umich.edu
URL:https://events.umich.edu/event/150177
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Mathematics
LOCATION:East Hall - 4088
CONTACT:
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20260814T161254
DTSTART;TZID=America/Detroit:20261204T150000
DTEND;TZID=America/Detroit:20261204T160000
SUMMARY:Workshop / Seminar:Combinatorics Seminar
DESCRIPTION:TBD
UID:150291-21908975@events.umich.edu
URL:https://events.umich.edu/event/150291
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Mathematics
LOCATION:
CONTACT:
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20260926T172355
DTSTART;TZID=America/Detroit:20270115T150000
DTEND;TZID=America/Detroit:20270115T160000
SUMMARY:Workshop / Seminar:Combinatorics Seminar
DESCRIPTION:TBA
UID:152923-21914804@events.umich.edu
URL:https://events.umich.edu/event/152923
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Mathematics
LOCATION:East Hall - 4088
CONTACT:
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20261022T110200
DTSTART;TZID=America/Detroit:20270122T150000
DTEND;TZID=America/Detroit:20270122T160000
SUMMARY:Workshop / Seminar:Combinatorics Seminar
DESCRIPTION:TBD
UID:153965-21916849@events.umich.edu
URL:https://events.umich.edu/event/153965
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Mathematics
LOCATION:East Hall - 4088
CONTACT:
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20261013T112605
DTSTART;TZID=America/Detroit:20270129T150000
DTEND;TZID=America/Detroit:20270129T160000
SUMMARY:Workshop / Seminar:Combinatorics Seminar (TBA)
DESCRIPTION:TBD
UID:153611-21916098@events.umich.edu
URL:https://events.umich.edu/event/153611
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Mathematics
LOCATION:East Hall - 4088
CONTACT:
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