822 reputation
1126
bio website
location Xianyang
age 28
visits member for 5 years, 6 months
seen Dec 17 '11 at 15:24
To learn and to share. Email: miwalin.math@gmail.com

May
31
awarded  Notable Question
Jan
25
awarded  Yearling
Sep
24
awarded  Autobiographer
Jul
2
awarded  Curious
Mar
25
awarded  Notable Question
Jan
23
awarded  Popular Question
Jul
2
awarded  Good Question
Jun
25
awarded  Citizen Patrol
Apr
17
awarded  Necromancer
Feb
5
awarded  Yearling
Jan
27
awarded  Popular Question
Jan
3
awarded  Notable Question
Apr
3
awarded  Popular Question
Feb
6
awarded  Yearling
Dec
17
accepted How to prove a known inequality from a book
Dec
15
awarded  Popular Question
Sep
30
awarded  Necromancer
Sep
2
comment Explanation of a proof of an determinant bound?
Btw, did you read that article by Yang 1990?
Sep
2
comment Explanation of a proof of an determinant bound?
It is not clear how you get \begin{eqnarray*} (x_2^TAx_2)(x_2^TA^{-1}x_2) &\le& \frac{(\lambda_2 + \lambda_{n-1})^2}{4\lambda_2\lambda_{n-1}}. \end{eqnarray*}
Aug
31
asked Explanation of a proof of an determinant bound?