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Linear Matrix Inequalities (LMIs)

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Reference request for linear matrix inequality with PSD matrices

In literature, people say a spectrahedron is the following set $$\left\{x \in \mathbb{R}^d : x_1 A_1 + \cdots + x_d A_d \geq B \right\}$$ where $\geq$ is in the positive semidefinite sense. Is there a …
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