Question: 4. Let U = 1] ... Um be an m x n matrix with orthonormal columns, which means that the columns are all unit vectors

4. Let U = 1] ... Um be an m x n matrix with orthonormal columns, which means that the columns are all unit vectors and form an orthogonal set; i.e. u, . u, = 0 for all i # j, and |ju, | | = 1 for all 1

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