Seminars and Talks 10:30 - 11:30, May 25, 2023 (Thursday) Cisco Webex, Online seminar On the Rational Cuspidal Divisor Class Groups of Drinfeld Modular Curves X_0(p^r) 16:00 - 17:00, May 25, 2023 (Thursday) Room 515, Cosmology Building, National Taiwan University + Cisco WebEx, Physical+Online Seminar Sheaf Theoretic Methods in Symplectic Geometry