2009-02-08

[線性代數]

T or F
if B is m*n and x is a unit vector in R^n, then 2norm{ Bx } <= σ1, where σ1 is the first singular value of B

可不可以詳解這一題
感謝

1 則留言:

線代離散助教(wynne) 提到...

||Bx|| = ||Bx||/||x|| ≦ ||B||_2
= the square root of the largest eigenvalue
of (B^T)B = σ1