2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/103870Let $N$ be a smooth manifold and $f:N\to N$ be a $C^l$, $l\geq 2$ diffeomorphism. Let $M$ be a normally hyperbolic invariant manifold, not necessarily compact. We prove an analogue of the $λ$-lemma in this case.21 pagesDynamical Systems37D05; 37D10; 37C29; 37G99text