Seminars and Talks 10:30 - 12:00, May 21, 2018 (Monday) R617, Astronomy-Mathematics Building, NTU Lectures on Sigma-models and Branes 11:15 - 15:00, May 21, 2018 (Monday) Room 3177, Department of Mathematics, NCKU On the Estimates of the Gain Term of the Boltzmann Collision Operator