[Postgraduate Mathematics] Proof and derivation: Let A and B be positive definite matrices of order m and n, respectively, then the block matrix C=[A, O, O, B] is a positive definite matrix

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[Postgraduate Mathematics] Proof and derivation: Let A and B be positive definite matrices of order m and n, respectively, then the block matrix C=[A, O, O, B] is a positive definite matrix

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