I want to know any subgroups of the infinite direct sum of the abelian group $\Bbb{Z}_{p^n}$ where $p$ is a prime number.
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There's a lot of them.... – Angina Seng Jun 13 '20 at 06:18
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Welcome to MSE. Your question is phrased as an isolated problem, without any further information or context. This does not match many users' quality standards, so it may attract downvotes, or closed. To prevent that, please [edit] the question. This will help you recognise and resolve the issues. Concretely: please provide context, and include your work and thoughts on the problem. These changes can help in formulating more appropriate answers. – José Carlos Santos Jun 13 '20 at 06:28