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location Xianyang
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visits member for 4 years, 9 months
seen Dec 17 '11 at 15:24
To learn and to share. Email: miwalin.math@gmail.com

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accepted How to prove a known inequality from a book
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Sep
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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*}
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asked Explanation of a proof of an determinant bound?
Aug
8
comment Eigenspace of Euclidean distance matrix.
+1, Thanks, I know this fact. Do you think if it is possible to characterize the orthogonal matrix $P$ such that $P^TMP$ is diagonal?
Aug
8
asked Eigenspace of Euclidean distance matrix.