Normal subgroup 

Another way to put this is saying that right and left cosets of N in G coincide:

N g = g g^-1 N g = g N    for all g in G.

Normal subgroups are of relevance because if N is normal, then the factor group G/N may be formed. Normal subgroups of G are precisely the kernels of group homomorphisms f : G -> H.

{e} and G are always normal subgroups of G. If these are the only ones, then G is said to be simple.

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