Abstract:
A topological group $G$ is said to be universal in a class $\mathscr K$ of topological groups if $G\in\mathscr K$ and if for every group $H\in\mathscr K$ there is a subgroup $K$ of $G$ that is isomorphic to $H$ as a topological group.
A group is constructed that is universal in the class of separable metrizable topological Abelian groups.