An abelian topological group can be considered simply as an abelian group or as a topological space. The question considered in this article is whether the topological group structure is determined by these weaker structures. Denote homeomorphism, isomorphism, and homeomorphic isomorphism by ≈, ≅ , and =, respectively. The principal results are these.
Theorem 1. If G 1andG 2are locally compact and connected, then G 1≈ G 2implies G 1= G 2.