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Homework Help: Permutable matrices

  1. Oct 3, 2006 #1
    I have this question as homework from my Algebra class:
    A square matrix X is called exchangeable with A if AX=XA.Determine the set of permutable matrices with matrix.jpg

    My question is,how do I find that set?I know that a matrix to be permutable all rows and columns must be the same and that a square matrix is composed by the same number of rows and columns.
    Thanks in advance for the help!
     
  2. jcsd
  3. Oct 3, 2006 #2

    matt grime

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    You defined exchangable, not permutable, so who knows?
     
  4. Oct 3, 2006 #3
    By exchangeable i meant permutable...
     
  5. Oct 3, 2006 #4

    matt grime

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    You defined what it means for X to be exchachangable *with A*, not what it means for X to be exchangable, or permutable.
     
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