2 7 Permutation Matrix

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The permutation matrix is all permutations of the rows of the identity matrix. And, the permutation matrix enable PA=LU when a row exchange is needed.
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Yes the vdeo was so helpful😻... Thanku sir😍

fifafifa
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I have a question: Wouldn't there be 5 permutation matrices, which would be P_21, P_31, P_32, P_32 x P_21, P_21 x P_32 ?
Why did you count the identity matrix as a permutation matrix?

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