Foliations on modular curves
arXiv:0903.2983 · doi:10.1007/s00574-016-0006-8
Abstract
It is proved, that a foliation on a modular curve given by the vertical trajectories of holomorphic differential corresponding to the Hecke eigenform is either the Strebel foliation or the pseudo-Anosov foliation.
to appear Bulletin of the Brazilian Mathematical Society, New Series