# Talk:Open Quantum Systems/The Density Matrix

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## Observable/Hermitian Basis[edit]

Partly question, partly suggestion: "Since the Pauli matrices and the identity form a basis for the vector space of hermitian complex matrices, we can expand any observable..." I would mention the fact (? is it so?). --Nobelium (discuss • contribs) 18:56, 12 April 2014 (UTC)