Dicussion on Permutation Matrices and examples where P1P2 equal/NOT Equal P2P1 Pr 2-7-9

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Introduction to Linear Algebra
Strang 4th edition
Problem 2-7-9
If PI and P2 are permutation matrices, so is PI P2. This still has the rows of I in some order. Give examples with P1P2 =f:. P2P1 and P3P4 = P4P3.
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