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A square matrix is orthogonal if $$A^T A = I$$.
Implies $$A^{-1} = A^T$$ and $$\det(A) = \pm 1$$.
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A square matrix is orthogonal if $$A^T A = I$$.
Implies $$A^{-1} = A^T$$ and $$\det(A) = \pm 1$$.
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