what is the difference s subgroup and abelian group
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subgroups of abelian groups are indeed abelian, and your thought process has the right idea. Showing this is pretty easy. Take an abelian group G with subgroup H. Then we know that, for all a,b∈H, ab=ba since it must also hold in G (as a,b∈G≥H and G is given to be abelian)
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