The commutator subgroup is the subgroup generated by all the commutators of a group, which are elements of the form $$[g,h] = g^{-1}h^{-1}gh$$ for elements $$g$$ and $$h$$ in the group. This subgroup is crucial in understanding the structure of a group, particularly in relation to its abelian properties and its quotient groups, and plays a significant role in analyzing Galois groups and their corresponding field extensions.
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