Exercises 22–26 provide a glimpse of some widely used matrix factorizations, some of which are discussed later in the text.
(Reduced LU Factorization) With A as in the Practice Problem, find a 5 × 3 matrix B and a 3 × 4 matrix C such that A = BC. Generalize this idea to the case where A is m × n, A = LU, and U has only three nonzero
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