Jiazhong Yang, Peking University
Middle Lecture Room, Math Building
I will put two topics in one talk: first, I will give a brief survey, followed by some of our new results, about piecewise differential equations. Some personal viewpoint and remarks on this subject will also be given. Instead of presenting technical details, I will give a geometric explanation about our results. In the second part of my talk, I will explain our new results of the Lienard systems, illustrating a systematic conclusion obtained very recently on hyper-elliptic limit cycles.