2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/64874We define Strebel differentials for stable complex curves, prove the existence and uniqueness theorem that generalizes Strebel's theorem for smooth curves, prove that Strebel differentials form a continuous family over the moduli space of stable curves, and show how this construction can be applied to clarify a delicate point in Kontsevich's proof of Witten's conjecture.45 pages, 9 figures. A significantly extended versionAlgebraic Geometrytext