Relativistic Structure ofSU(6)

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Abstract
It is shown that a relativistic basis for invariance under SU(6) exists only if the group structure is extended to U+(6)⊗U−(6) for any interaction terms. The notion of an inhomogeneous extension Uw+(6)⊗Uw−(6) is introduced. This extension leaves the kinetic-energy terms invariant, though it still does not provide a fully satisfactory theory.