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=== Block matrices and submatrices ===
A positive <math>2n \times 2n</math> matrix may also be defined by [[block matrix|blocks]]:
<math display="block">M = \begin{bmatrix} A & B \\ C & D \end{bmatrix}</math>
where each block is <math>n \times n ~,</math> By applying the positivity condition, it immediately follows that <math>A</math> and <math>D</math> are hermitian, and <math>C = B^* ~.</math>
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