Coset
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If G is a group and H a subgroup of G, x is an element in G, and h is an element in H the cosets of H in G are defined as follows:
- Left coset: xH is the set H with every element h of H multiplied by x on the left.
- Right coset: Hx is the set H with every element h of H multiplied by x on the right.
When xH = Hx we say that H is normal in G.
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