Dual To Center
The outer automorphism group is dual to the center in the following sense: conjugation by an element of G is an automorphism, yielding a map The kernel of the conjugation map is the center, while the cokernel is the outer automorphism group (and the image is the inner automorphism group). This can be summarized by the short exact sequence:
Read more about this topic: Outer Automorphism Group
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