On smooth separatrices of foliations on singular surfaces.

We consider foliations on a germ of an isolated surface singularity. We give criteria for the existence of smooth separatrices in terms of the maximal cycle of a desingularization of the surface. We apply these criteria for some examples of quasi-homogeneous singularities, in particular rational double points; moreover, for these singularities we show for which cases there exist a smooth separatrix for foliations defined by sufficiently general derivations. [ABSTRACT FROM AUTHOR]