2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/218930We study the divisorial Zariski decomposition on varieties whose first Chern class is zero. We first prove that any exceptional divisor is contractible (up to a birational map that is an isomorphism in codimension one). We then characterize prime exceptional divisors on holomorphic symplectic manifolds.11 pages, frenchAlgebraic Geometry14J99; 14C99; 14E30text