2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/160469We proved the existence and uniqueness of a traveling wave solution to the thin film equation with a Navier slip condition at the liquid-solid interface. We obtain explicit lower and upper bounds for the solution and an absolute error estimate of approximation of a solution to the thin films equation by the traveling-wave solution.14 pages, 2 figureAnalysis of PDEs76A20; 76D08; 35K55; 35K65; 35Q35text