The two column vectors v\ and v2 of a 2 x 2 matrix 4 are shown in the accompanying
Chapter 5, Problem 42(choose chapter or problem)
The two column vectors v\ and v2 of a 2 x 2 matrix 4 are shown in the accompanying figure. Let A = QR the QR factorization of A. Represent the diagonal entries r\ 1 and r22 of R as lengths in the figure. Interpret the product r\] r22 as an area.
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