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.
We need at least 10 more requests to produce the solution.
0 / 10 have requested this problem solution
The more requests, the faster the answer.