Seminars and Talks 15:00 - 16:15, September 24, 2019 (Tuesday) R609, Astronomy-Mathematics Building, NTU Mass Formula for Principally Polarized Supersingular Abelian 3-folds (II) 15:30 - 17:30, September 24, 2019 (Tuesday) R440, Astronomy-Mathematics Building, NTU A Maximum Principle for Diffusive Lotka-Volterra System of Two Species