2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/67623In this paper, we prove the termination of 4-fold semi-stable log flips under the assumption that there always exist 4-fold (semi-stable) log flips.11 pages, a revised version of my preprint: Termination of 4-fold semi-stable flipsAlgebraic Geometry14E30; 14J35; 14E05text