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Properties of the leftnullspace

  1. Dec 12, 2008 #1
    In class my professor row reduced a matrix A into the form U. Then he started to go over how to find the basis for the left nullspace in a matrix A.

    Instead of going through the entire process of row reducing the transpose of A and finding its nullspace, he just used the last row of the elimination matrix E as the basis.

    Can someone explain why this is so? Is it just a property of the leftnullspace? And can I use it for finding the basis of N(A^T) for any row reduced matrix?
     
  2. jcsd
  3. Dec 12, 2008 #2

    HallsofIvy

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    No, that's not a general property. I suspect that this particular nullspace was one-dimensional and so could be spanned by a single vector. That is not generally true.
     
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