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Unitary matrix question 
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#1
Jun1711, 10:36 PM

P: 90

"orthonormal columns imply orthonormal rows for square matrix."
My proof is: [itex]Q^{T}Q=I[/itex](orthonormal columns) implys [itex]QQ^{T}=I[/itex](orthonoraml rows) 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? 


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