2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/60927In the article math.AG/0102085, Lemma 5.5 was false. Hence the decomposition theorem (Theorem 5.8) and all statements in Section 7 are not proved.withdrawal noticeAlgebraic GeometryCombinatorics14M25text