2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/173590We pose the problem to determine explicit defining equations of various elliptic fibrations on a given $K3$ surface, and study the case of the Kummer surfaces of the product of two elliptic curves.34 pages, 17 figures; section 6 added, typos correctedAlgebraic Geometry14J27; 14J28Elliptic parameters and defining equations for elliptic fibrations on a Kummer surfacetext