Seminars and Talks 11:00 - 12:30, October 11, 2017 (Wednesday) R638, Astronomy-Mathematics Building, NTU Effective Action from $M$-theory on Twisted Connected Sum $G_2$-Manifolds 13:10 - 15:00, October 11, 2017 (Wednesday) Room 3176, Department of Mathematics, NCKU Survey of Topological Degree for Mean Field Equation