2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/100969In this paper the height zeta function associated to a certain singular del Pezzo surface of degree four is studied. If $U$ denotes the open subset formed by deleting the unique line from this surface, then an asymptotic formula for the number of rational points of bounded height on $U$ is established which verifies the Manin conjecture.30 pagesNumber TheoryAlgebraic Geometry11G35 (14G05, 14G10)On Manin's conjecture for singular del Pezzo surfaces of degree four, Itext