2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/144262The main purpose is to generalize a theorem of Arendt about uniqueness of $C_0$-semigroups from Banach space setting to the general locally convex vector spaces, more precisely, we show that cores are the only domains of uniqueness for $C_0$-semigroups on locally convex spaces. As an application, we find a necessary and sufficient condition for that the mass transport equation has one unique $L^1(\R^d,dx)$ weak solution.Functional Analysis47D03, 47F05 (Primary); 60J60 (Secondary)Uniqueness of a pre-generator for $C_0$-semigroup on a general locally convex vector spacetext