A spectrahedron is a convex body defined by a linear matrix inequality of the form *A_0 + x_1 A_1 + ... + x_n A_n \preceq 0*.
The matrices *A_i* are symmetric *m \times m* real matrices and *\preceq 0* denoted negative semidefiniteness.

- matrices
A List that contains the matrices

*A_0, A_1, ..., A_n*.

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