In mathematics, in the realm of group theory, an IA automorphism of a group is an automorphism that acts as identity on the abelianization.
[1] The abelianization of a group is its quotient by its commutator subgroup.
An IA automorphism is thus an automorphism that sends each coset of the commutator subgroup to itself.
The IA automorphisms of a group form a normal subgroup of the automorphism group.
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