Abstract: We investigate some simple finite element discretizations for
the axisymmetric Laplace equation and the azimuthal component of the
axisymmetric Maxwell equations as well as multigrid algorithms for these
discretizations. Our main result is that the standard V-cycle with point
smoothing converges at a rate independent of the number of unknowns. This is
contrary to suggestions in the existing literature that line relaxations and
semicoarsening are needed in multigrid algorithms to overcome difficulties
caused by the singularities in axisymmetric problems. Our multigrid analysis
proceeds by applying the well known regularity based multigrid theory. In order
to apply this theory, we prove regularity results for the axisymmetric Laplace
and Maxwell equations in certain weighted Sobolev spaces. These, together with
some new finite element error estimates in certain weighted Sobolev norms, are
the main ingredients of our analysis.