Seminars and Talks 13:30 - 14:45, April 23, 2019 (Tuesday) R609, Astronomy-Mathematics Building, NTU EKOR strata of Siegel modular varieties 15:30 - 17:00, April 23, 2019 (Tuesday) R440, Astronomy-Mathematics Building, NTU Toric Morphisms and Proper Toric Varieties 15:30 - 17:30, April 23, 2019 (Tuesday) R430, Astronomy-Mathematics Building, NTU Applying Matrix Tree Theorem to the Construction of some Lyapunov Functions in Infectious Disease Models