  The observed quantization of the Hall conductivity in graphene at high
magnetic fields is explained as being due to the dynamically generated spatial
modulation of either the electron spin or the density, as decided by the
details of Coulomb interaction on the scale of lattice constant. It is
predicted that at a large in-plane component of the magnetic field such
ordering will be present only at the filling factor |f|=1, and absent
otherwise. Other experimental consequences of the theory are outlined.
