  There are constructed exact solutions of the quantum-mechanical Dirac
equation for a spin S=1/2 particle in Riemannian space of constant negative
curvature, hyperbolic Lobachevsky space, in presence of an external magnetic
field, analogue of the homogeneous magnetic field in the Minkowski space. A
generalized formula for energy levels, describing quantization of the motion of
the particle in magnetic field on the background of the Lobachevsky space
geometry, has been obtained.
