If Q is an m x n (m > n) matrix with orthonormal columns, we know that [itex]Q^TQ = I[/itex] of dimension n x n. I have a question about [itex]QQ^T[/itex]. It is a symmetric m x m matrix but also appears to be singular. Why would it be singular? Probably something basic I've long since forgotten.(adsbygoogle = window.adsbygoogle || []).push({});

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# Matrix with Orthonormal columns

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