2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/127545We prove a lower bound on the Seshadri constant $ε(L)$ on a $K3$ surface $S$ with $\Pic S \simeq \ZZ[L]$. In particular, we obtain that $ε(L)=α$ if $L^2=α^2$ for an integer $α$.3 pagesAlgebraic Geometry14J28, 14C20text