Question: solve 4. Let A be an invertible square 3 x 3 matrices. (a) Show that A is equal to UPL for some lower triangular matrix

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4. Let A be an invertible square 3 x 3 matrices. (a) Show that A is equal to UPL for some lower triangular matrix L, some upper triangular matrix U and permutation matrix P. (See Assignment 1 for the definition of a permutation matrix.) (b) Is the expression U PLE above unique

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