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Results tagged with linear-algebra
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user 737
Questions about the properties of vector spaces and linear transformations, including linear systems in general.
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Rank of ABA where B is positive definite
I have a n-by-k matrix A and a n-by-n matrix B, where B is positive definite. I can form the matrix $M = A^t B A$. Playing around, I always found $rk(M) = rk(A)$ but I can't prove this.
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