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Homework Help: Permutation matrices

  1. Sep 12, 2006 #1
    I can't proove why P inverse = P transpose always!
    P is the permuation matrix, i.e. a matrix is identity but the rows can be interchanged.
    Thanks in advance.
  2. jcsd
  3. Sep 13, 2006 #2

    matt grime

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    I can offer no other advice than that you should just write down PP^t (the rows of P are an ******* basis of R^n - fill in the *******).
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