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Math Help - Linear Algebra Question I'm Stuck On

  1. #1
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    Linear Algebra Question I'm Stuck On

    Prove that R^n,n , the set of all real nxn matrices forms a vector space over R of dimension n^2. Determine which of the following subsets of R^3,3 are subspaces and (when possible) find a basis for the subspace and determine the dimension.

    (a)The set of all diagonal matrices A with aij (i and j supposed to be subscripts)not equal to zero for i not equal to j.

    (b)The set of all matrices A with detA=0

    (c)The set of all upper triangular matrices A with aij=0 (again, i and j being subscripts) for i>j

    (d)The set of all matrices with traceA=0
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  2. #2
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    Quote Originally Posted by alexmin View Post
    Prove that R^n,n , the set of all real nxn matrices forms a vector space over R of dimension n^2. Determine which of the following subsets of R^3,3 are subspaces and (when possible) find a basis for the subspace and determine the dimension.

    (a)The set of all diagonal matrices A with aij (i and j supposed to be subscripts)not equal to zero for i not equal to j.

    (b)The set of all matrices A with detA=0

    (c)The set of all upper triangular matrices A with aij=0 (again, i and j being subscripts) for i>j

    (d)The set of all matrices with traceA=0
    There is a lot to do in this problem. What did you do so far and are unable to show?
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