  The classical Lippmann-Schwinger equation plays an important role in the
scattering theory (non-relativistic case, Schr\"odinger equation). In the
present paper we consider the relativistic analogue of the Lippmann-Schwinger
equation. We represent the corresponding equation in the integral form. Using
this integral equation we investigate the stationary scattering problems
(relativistic case, Dirac equation). We consider the dynamical scattering
problems (relativistic case, Dirac equation) as well.
