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If $G$ is a group and $g\in G$, then the function $\phi_g:G\to G$ given by \[ \phi_g(x) = gxg^{-1} \] is an automorphism of $G$ called an inner automorphism.

The set of inner automorphisms $\mathrm{Inn}(G)$ is a subgroup of $\Aut(G)$, and \[ \mathrm{Inn}(G) \cong G/Z(G)\] where $Z(G)$ is the center of $G$.

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  • Review status: beta
  • Last edited by John Jones on 2019-05-23 19:14:50
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