2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/79093We study lower bounds for the self-intersection of the canonical divisor of "canonical varieties" (i.e. varieties whose canonical linear system gives a birational map). We give some improvements for the known results in the case of surfaces and new bounds for the case of canonical threefolds.23 pagesAlgebraic Geometrytext