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F. Eqs, we see that odd powers of 1/2 appear in the power expansion of the distances as even derivatives of and odd derivatives of H . In the expansion of the energy, the odd powers of 1/2 necessarily include odd powers of such terms, and thus they change sign in a parity transformation. Since the resulting equations should be invariant under parity, odd powers of 1/2 in the Lagrangian density should necessarily be in a factor of exact X derivatives, as shown for the 3

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