  We investigated hydrodynamical post-Newtonian models of selfgravitating
stationary black-hole-disk systems. The post-Newtonian scheme presented here
and also in our recent paper is a continuation of previous, purely Newtonian
studies of selfgravitating hydrodynamical disks rotating according to the
Keplerian rotation law. The post-Newtonian relativistic corrections are
significant even at the 1PN level. The 1PN correction to the angular velocity
can be of the order of 10% of its Newtonian value. It can be expressed as a
combination of geometric and hydrodynamical terms. Moreover, in contrast to the
Newtonian Poincare-Wavre theorem, it depends both on the distance from the
rotation axis and the distance from the equatorial plane.
