Abstract

All possible standard relativistic equations for spin-1/2 waves, with Harish-Chandra degree four, involving auxiliary spins 1/2 and 3/2, are explicity constructed. There are just three of them. The list of all fermion equations of degree up to four, covariant for a representation [n1(3/2, 0) ⊗n2(1, 1/2) ⊗n3(1/2, 0)] ⊗ [conjugate] of the Lorentz group has thus been completed.

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