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Math Help - determining matrix size

  1. #1
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    determining matrix size

    Show that if A is an [m x n] matrix and A(BA) is defined, then B is an [n x m] matrix.
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  2. #2
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    If A has order m\times n look at BA first of all

    For be BA to be defined B must have order k\times m in turn BA must have order k\times n

    Now for A(BA) to be defined k=n therefore B has order n\times m
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  3. #3
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    thank you, easy to understand when its right in front of me
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