Relativistic Equation Represented in Pauli Spinor Space for Two-Fermion Scattering States

The Bethe-Salpeter equation for two-ferrnion scattering states is reduced to an equivalent Pauli-Schriidinger equation. The latter equation provides a new approach to the relativistic scct tering problem. Since this equation may avoid the problem of solving coupled equations, it appears to be more convenient than the Bethe-Salpeter equation in practical applications.