2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/62374Let $M$ be an $n$-dimensional manifold supporting a quasi Anosov diffeomorphism. If $n=3$ then either $M={\mathbb T}^3$, in which case the diffeomorphisms is Anosov, or else its fundamental group contains a copy of ${\mathbb Z} ^6$. If $n=4$ then $Π_1(M)$ contains a copy of ${\mathbb Z} ^4$, provided that the diffeomorphism is not Anosov.5 pagesDynamical Systems37D20 (Primary) 37C15 (Secondary)text