Seminars and Talks 14:00 - 15:00, April 19, 2021 (Monday) Lecture Room B, 4th Floor, The 3rd General Building, NTHU From Energy-Time Uncertainty to Symplectic Topological Displacement 15:30 - 16:45, April 19, 2021 (Monday) R609, Astronomy-Mathematics Building, NTU Cohomological Groups of Algebraic Tori (II)