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Exercise 1.7.23

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Since $A$ has independent columns, given a $x \neq 0$ , we have $y = Ax \neq 0$ , also since $C$ is positive definite, so $y^{T} Cy = x^{T} A^{T} CAx > 0$ , so $S = A^{T} CA$ is positive definite.

niuers

2020-03-20 00:00

Exercise 1.7.23

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