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I have a question on the decomposition of polynomial matrices. Suppose $ A(\lambda) = \sum_{j=0}^L \lambda^j A_j$ is an $ n \times n$ matrix of polynomials, which is Hermitian on the real axis $ \lambda \in \mathbb{R}$ . What is the necessary and sufficient condition to decompose $ A(\lambda)$ into the following form: $ $Read more