2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/157317Let $X$ be a hypersurface in $\mathbb{P}^{4}$ of degree $d$ that has at most isolated ordinary double points. We prove that $X$ is factorial in the case when $X$ has at most $(d-1)^{2}-1$ singular points.7 pages, typos removedAlgebraic GeometryCommutative Algebra14J30, 14J70, 14B05, 13F15text