Seminars and Talks 11:00 - 12:30, October 24, 2018 (Wednesday) R638, Astronomy-Mathematics Building, NTU Maximum $d$-degenerate Subgraph of a Planar Graph 16:00 - 17:00, October 24, 2018 (Wednesday) R440, Astronomy-Mathematics Building, NTU Knotted Surfaces in the 3-space, II