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Math Help - The dimension of the nullspace of A?

  1. #1
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    The dimension of the nullspace of A?

    Just question v. of the question.

    The answer key says it's 7, but I don't know why, if anyone could explain.
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    Last edited by DarK; October 21st 2010 at 07:03 PM.
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  2. #2
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    Quote Originally Posted by DarK View Post
    Just question v. of the question.

    The answer key says it's 7, but I don't know why, if anyone could explain.

    Thanks!


    We can se a 3 x 7 matrix as a mapping from a 7-dimensional vector space to a 3-dimension v.s., and since the zero matrix takes ALL the 7-dim. v.s. to zero its nullspace is all of this space...

    Tonio
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