Speaker:: 蔡天新 浙江大学数学学院 Venue: B1044 Time: 2016年9月21日 10:00-11:00. Title: In this talk, we will discuss several classic and contemporary number theory problems, such as perfect numbers, FLT, Waring problem, Goldbach problem, Schinzel’s equation, abcd equation and congruenct integers problem. Some of them are related with theory of elliptic curves. We will treat them with the viewpoint of so-called yin-yang equations, and give some new results and raise some new problems.