Where have you used the fact that Q and Z are orthogonal?
Hi,
my book says that it is easy to show that for all orthogonal Q and Z of appropriate dimensions we have
.
I'm thinking that , and .
The 2-norm of a matrix is defined as,
and so
.
I do not know what to do here.. Any tips are greatly appreciated. Thanks.
I don't see clear your third equality. Denote
I'd better use:
Then,
That is,
are similar matrices. As a consequence:
which implies:
Fernando Revilla