I am a Chinese undergraduate student who majors in Physics and Mathematics at Tsinghua University, Beijing, PRChina. I like solving Mathematical problems in my spare time.
4 How to prove that a skew-symmetric matrix with integer entries has a determinant that is a square of some integer? [duplicate] jan 13 '13
2 Prove that the fundamental group of $X$ is Abelian nov 21 '13
1 The intersection of two minimal prime ideals. oct 1 '13