prove that the symmetric projection is always orthogonal.

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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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Hint: In general, we have $\ker(A) = \operatorname{im}(A^T)^\perp$ (ker denotes the kernel/nullspace and im denotes the image/column-space)