Use the Levi-Civit`a symbol to prove that (a) (A B) (C D) = (A
Question:
Use the Levi-Civit`a symbol to prove that
(a) (A × B) · (C × D) = (A · C)(B · D) − (A · D)(B · C).
(b) ∇ · (f × g) = g · (∇ ×f) − f · (∇ ×g).
(c) (A × B) × (C × D) = (A · C × D)B − (B · C × D)A.
(d) The 2 × 2 Pauli matrices σx, σy , and σz used in quantum mechanics satisfy σiσj = δij + iεijkσk . If a and b are ordinary vectors, prove that (σ · a)(σ · b) = a · b + iσ · (a × b).
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