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    Invariant Subgroup

    Basic definition

    A normal subgroup is a subgroup that is fixed under conjugation by any element.

    Detailed definition

    Let H be a subgroup of a group G. The similarity transformation of H by a fixed element x in G not in H always gives a subgroup. If
x H x^(-1) = H
for every element x in G, then H is said to be a normal subgroup of G, written H⊲G. Normal subgroups are also known as invariant subgroups or self-conjugate subgroup.
All subgroups of Abelian groups are normal.

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