Write explicitly the (2 times 2) matrices (g=e^{i alpha_{i} sigma_{i} / 2}), where (sigma_{i}) are the Pauli
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Write explicitly the \(2 \times 2\) matrices \(g=e^{i \alpha_{i} \sigma_{i} / 2}\), where \(\sigma_{i}\) are the Pauli matrices, and compare with \(g(\theta, \phi, \psi)\) for \(S O(3)\), to find an explicit map between \(\alpha_{i}\) and the Euler angles \((\theta, \phi, \psi)\).
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