High Quality Content by WIKIPEDIA articles! High Quality Content by WIKIPEDIA articles! In physics, the Pauli matrices are a set of 2 x 2 complex Hermitian and unitary matrices (See also ref.[1]). Usually indicated by the Greek letter 'sigma' (?), they are occasionally denoted with a 'tau' (?) when used in connection with isospin symmetries. They are: sigma_1 = sigma_x = begin{pmatrix} 0

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