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    Show that any matrix A can be written as a sum of rank-1 matrices. And show how these rank-1 matrices can be chosen so that only r of them are necessary (where r=rank(A)).

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    Show that any matrix A can be written as a sum of rank-1 matrices. And show how these rank-1 matrices can be chosen so that only r of them are necessary (where r=rank(A)).

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    Show that any matrix A can be written as a sum of rank-1 matrices. And show how these rank-1 matrices can be chosen so that ...

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