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seen Apr 28 '13 at 8:19

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comment Are the eigenvalues of $AB$ equal to the eigenvalues of $BA$? (Citation needed!)
@Phira thank you very much!
Dec
13
comment Consider the quadratic form $q(x,y,z)=4x^2+y^2−z^2+4xy−2xz−yz $ over $\mathbb{R}$ then which of the following are true
I'm wondering if checking to see if it is positive definite will also help find us the range?