Speaker：Lutian Zhao (Kavli IPMU, University of Tokyo)Time:November 4, 2026, 2:00–3:00 pmVenue:HIMIS 7A1Title:What is Gopakumar-Vafa invariantAbstract:Gopakumar–Vafa invariants are integer-valued curve-counting invariants of Calabi–Yau threefolds. In this talk, I will introduce their geometric in
Speaker:Ingrid Irmer (SUSTech)Time: October 28 (Wed), 2026, 4:00-5:00 pmLocation: HIMIS 7A1Title: Topological Morse functions and Moduli spaceAbstract:Topological Morse functions are continuous functions whose critical points satisfy a nondegeneracy property similar to their smooth count
Speaker:Stavros Garoufalidis (SUSTech)Time:September 23 (Wed), 2026, 4:00-5:00 pmLocation:HIMIS 7A1Title:Can you compute the genus of a knot?Abstract:A knot is a circle in 3-space, allowed to move as long as it does not intersect itself. Every knot bounds an (oriented surface), and the smallest genu
Title:A p-adic interpolation of the Cogdell liftAbstract:The Cogdell lift is the analogue for Picard modular surfaces of the celebrated Hirzebruch-Zagier theorem. Roughly speaking, the lift takes a class in middle cohomology of a fixed modular surface, and lifts it to a Fourier ser