A pseudo-Anosov foliation of a compact orientable surface $ F$ is a one whose class in the space $ \mathcal{PMF}(F)$ of projective measured foliations is preserved by some pseudo-Anosov homeomorphism of $ F$ . I saw it casually mentioned that pseudo-Anosov foliations are dense in $ \mathcal{PMF}(F)$ . What is a proper reference for thatRead more