|Jun17-11, 10:36 PM||#1|
unitary matrix question
"orthonormal columns imply orthonormal rows for square matrix."
My proof is:
for square matrix.
But i think this proof is kind of indirect. Is there another more direct proof from the definition of inner product or norm?
|Jun18-11, 03:53 AM||#2|
I think that's as direct and simple as it gets. I would only add the explanation of how [itex]Q^TQ=I[/itex] implies [itex]QQ^T=I[/itex].
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