 Real spectrum of a positive-Hermitian times Hermitian product (source code)

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= Real spectrum of a positive-Hermitian times Hermitian product

If $C$ is Hermitian positive definite and $D$ is Hermitian, every eigenvalue of $CD$ is real. Equivalently, $CD$ is similar to the Hermitian matrix $C^{1/2}DC^{1/2}$.

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