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4irm angular distribution assumed to commute boson field calculations canonical commutation laws center-of-mass choice of commutation commutation relations commute or anticommute commuting spinor fields coupling constants cross section terms derivative coupling different spinor fields Dirac equation eK(deg elk'X(k factor pair fermion fields field equations field operators fields are assumed free fields given Green's function Hamiltonian contains Hamiltonian density commute hermitian conjugate hyperon interacting spinor fields interaction Hamiltonian interaction terms interchange interference terms kayon lower sign applies matrix element mesons by nucleons number of transpositions obtained odd number perturbation theory pion pion-nucleon Plot of differential Postulate representations S+(x scalar SCATTERING AND PRODUCTION Second-order Feynman diagrams Sections for Scattering SF(x spacelike surface spin spinor fields anticommute spinor fields commute spinor fields interact spins connected ST(x symmetric group T(Bev Table IV continued total cross sections transpositions of different VACUUM EXPECTATION VALUE variational principle violated Yukawa-type interactions