I'm a student in the School of Mathematical Sciences of Peking University, China.
I'm interested in classical music and, of course, math problems~
13 A finite-dimensional vector space cannot be covered by finitely many proper subspaces? may 16 '12
5 What is good about simple Lie algebras? may 7 '12
5 In a ring $aba=0$ implies $ab=0$ or $ba=0$? sep 22 '12
4 How to interpret the power of $\pi$ in the expression of the volume of an n-dimensional ball? jan 6 '13
4 integration of fractions apr 22 '12
4 Any concrete example of ''right identity and left inverse do not imply a group''? [duplicate] sep 11 '12