Mathematics Seminars and Colloquia

Upcoming By Week By Month All series Algebra SeminarAlgebraic Geometry SeminarAnalysis SeminarArthur Reading SeminarAwards CeremonyColloquiumCombinatorial and Commutative Algebra SeminarComputational and Applied Math SeminarCreative Component PresentationDistinguished Colloquium SeriesDoctoral Thesis DefenseEnumerative Geometry / Intersection Theory SeminarGraduate Student SeminarLie Groups SeminarMasters Report PresentationMasters Thesis DefenseMath Club MeetingMathematics Education SeminarNumber Theory SeminarNumerical Analysis SeminarOSU-AWMOU/OSU Automorphic Forms SeminarQualifying Exam PresentationResearch Snapshot SeminarSenior Honors Thesis DefenseSpecial LectureTopology SeminarOther Calendar ⌄

Thu, Nov 12, 2026 Combinatorial and Commutative Algebra Seminar 4:00 PM MSCS 514 Shifted lower Bruhat intervals are EL-shellable Ed Richmond, OSU Abstract ⌄ PDF Abstract: The Bruhat partial order on a Coxeter group plays an important role in representation theory of Lie groups and the geometry of their associated Schubert varieties. In this talk, we will look at intervals in Bruhat order and study how their poset structure changes under a shift by some group element. It turns out, for lower intervals, the shifted poset structure remains graded with a unique maximal and minimal element. Moreover, the shifted poset is EL-shellable. Geometrically, these shifted poset structures correspond to imposing a "shifted" BB-filtration on a Schubert variety. Much of this work was done as part of the 2026 honors summer math camp hosted at Texas State University and is joint with Dave, Feng, Lesnevich, Oh, Wang and Wu.

Automatically add seminars to your own calendar (e.g., Google Calendar) via an ical link.

List of links (urls) directly to a seminar series.

To add/edit talks, log in below using the Announce calendar username/password:

Announce Seminar Calendar Login