2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/70380This paper has been withdrawn by the author. It is not true that plt blow-up of toric singularity is toric (in dimension 3 too) and the first main theorem is incorrect also. The error is in deformation argument. I am grateful to Ivan Cheltsov for discussions.Algebraic Geometrytext