Abstract
The extended Lorentz group, which includes the complete Lorentz group and the charge conjugation operation, is considered. It is shown that use of irreducible projective representations of the extended group requires the existence of charge multiplets. Charge symmetry and pair production of strange particles follow from invariance under reflections and charge conjugation and from the laws of conservation of electric and baryon charges. The Pauli-Gürsey transformation is valid for free nucleons. The requirement of invariance under this transformation in the case of interaction also leads to isobaric invariance for all particles in strong interactions.
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