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# 代數學問題 Let H be a non-empty...

Let H be a non-empty subset of the group G. Prove that H is a subgroup of G if given a,b∈H, then a^-1b∈H.

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Let H be a non-empty subset of the group G. Prove that H is a subgroup of G if given a,b∈H, then a^-1b∈H.

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