The matrix norm of the matrix in the matrix for matrix
2026-04-01 20:30:46.1775075446
Showing that a matrix is a orthogonal projector
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Assume that $X$ is a column vector that is a particular linear combination of columns of $Q$ plus something that is orthogonal to $\mathcal S$.
Work out what the elements of $Q^TX$ are, and then what $QQ^TX$ must be.