Let A be a positive definite matrix (positive eigenvalues). Let B be an upper triangular matrix, with ones in its main diagonal (i.e. all its eigenvalues are 1). Is there anything I can say about the eigenvalues of AB ? I would like to find a way to prove that AB has positive eigenvalues, if that's true.
Thanks.
Thursday, 11 July 2019
linear algebra - Eigenvalues of product of p.d. Matrix with upper-triangular Matrix
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