Question: Use the numerically stable version of the Gram-Schmidt process to find the QR factorizations of the 3 3, 4 4 and 5

Use the numerically stable version of the Gram-Schmidt process to find the QR factorizations of the 3 × 3, 4 × 4 and 5 × 5 versions of the tridiagonal matrix that has 4's along the diagonal and l's on the sub- and super-diagonals, as in Example 1.37.

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