Suppose C is positive definite (so y T C Y > 0 whenever y =f. 0) and A has independent
Chapter 6, Problem 35(choose chapter or problem)
Suppose C is positive definite (so y T C Y > 0 whenever y =f. 0) and A has independent columns (so Ax =f. 0 whenever x =f. 0). Apply the energy test to X T ATCAx to show that ATCA is positive definite: the crucial matrix in engineering.
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