- #1
PhilDSP
- 643
- 15
The earliest instance I've seen to this equation, involving the Pauli matrices, is from a 1967 paper by J. M. Levy-Leblond. But it seems general and useful enough that it must have been discovered earlier:
[itex](\sigma \cdot A)(\sigma \cdot B) = A \cdot B + i \sigma \cdot (A \times B)[/itex]
[itex](\sigma \cdot A)(\sigma \cdot B) = A \cdot B + i \sigma \cdot (A \times B)[/itex]
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