action. A moment map for this action is
constructed. Also, a converse to a theorem of Marsden and Weinstein
on the existence of moment maps for torus actions is derived for
compact surfaces.
JAMES S. WOLPER
A surface of revolution in R3 has a
natural symplectic action. A moment map for this action is
constructed. Also, a converse to a theorem of Marsden and Weinstein
on the existence of moment maps for torus actions is derived for
compact surfaces.