d*****y 发帖数: 140 | 1 C=A-B, where A is a orthogonal matrix and B is a digonal matrix with digonal
elements are all less than 1 greater than 0. For an arbitary vector x, 可以
保证 Cx的2-norm
一定小于x的2-norm么?
如果不能,有没有一个常数d (可以和A有关),使得如果diagonal entries of B都小于b
的话,上面的命题成立?
thx!
PS: 2-norm就是经典的欧氏距离。 |
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