Combinatorics & algebra seminar-Rotation-invariant web bases from hourglass plabic graphs

Wednesday, September 30, 2026 4:05 pm - 5:05 pm

Title: Rotation-invariant web bases from hourglass plabic graphs
Speaker: Stephan Pfannerer, U. Waterloo
Date and time: Wednesday, September 30, 4:05–5:05 pm
Place: MPA 310

Abstract: In 1995 Kuperberg introduced a collection of trivalent web bases encoding tensor invariants of U_q(sl₃). Extending these bases to general sl_r has remained an open problem. We present a solution for the case r = 4 by introducing hourglass plabic graphs, a new generalization of Postnikov's plabic graphs. This is joint work with Christian Gaetz, Oliver Pechenik, Jessica Striker, and Joshua Swanson.

Where

Media and Public Affairs Building 805 21st Street, NW Washington DC 20052

Room: MPA 310

Admission

Open to everyone.