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user795571

Let $G$ be a locally finite group all of whose proper subgroups are finite. Then $G$ is Prüfer group. (It is an open problem if locally finite is necessary). link

$\frac{\Bbb Q}{\Bbb Z}\sim \sum_{p}\Bbb Z_{p^\infty}$. link

http://math.stackexchange.com/questions/933844

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