Let H and K be subgroups of a group G and let HK = {hk
Chapter 8, Problem 6SE(choose chapter or problem)
Let H and K be subgroups of a group G and let HK = {hk | h?H, k?K} and KH = {kh | k ? K, h ? H}. Prove that HK is a group if and only if HK = KH.
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