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Jan 4, 2015 at 15:43 vote accept math110
Jan 3, 2015 at 16:56 history edited Christian Remling CC BY-SA 3.0
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Jan 3, 2015 at 6:33 comment added math110 Oh,It's Nice! Thank you,+1,Use your idea,I found $P=B+\text{diag}{(1,2,3,\cdots,n)}$,where $B=(b_{ij}),b_{i,j}=\min{(i,j)}$,if we prove $B$ is postive definite,also solve this problem too
Jan 3, 2015 at 5:09 history undeleted Christian Remling
Jan 3, 2015 at 5:09 history edited Christian Remling CC BY-SA 3.0
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Jan 1, 2015 at 19:19 history deleted Christian Remling via Vote
Jan 1, 2015 at 19:14 history answered Christian Remling CC BY-SA 3.0