作者Nohporelleb ()
看板Math
标题[线代] 两题矩阵性质的证明题
时间Sun Dec 26 15:15:56 2010
1. Show that all permustation matrices are normal.
2. Show that if A and B are both positive definite, so is A+B.
麻烦了，感谢指导！
--
※ 发信站: 批踢踢实业坊(ptt.cc)
◆ From: 114.37.122.194
1F：推 smartlwj :2.for all x非0, x^t(A+B)x=x^tAx+x^tBx > 0 12/26 15:40