Questions tagged [orthogonal-matrices]

Matrices with orthonormalized rows and columns. An orthogonal matrix is an invertible real matrix whose inverse is equal to its transpose. For complex matrices the analogous term is *unitary*, meaning the inverse is equal to its conjugate transpose.

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prove that the symmetric projection is always orthogonal.

prove that the symmetric projection is always orthogonal. answer : we have: null(A)=ran(At) then A=At so null(A)=ran(A)
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