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OpenStudy (anonymous):
How do you prove something is a subgroup for an abelian group? For example; Suppose H and K are subgroups of G, and define HK as follows; HK={xy:x is an element of H and y is and element of K}. Prove that HK is a subgroup of G.
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OpenStudy (zarkon):
use the one or two step subgroup test
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