Definition:Inner Automorphism

Definition
Let $G$ be a group.

Let $x \in G$.

Let the mapping $\kappa_x: G \to G$ be defined such that:
 * $\forall g \in G: \map {\kappa_x} g = x g x^{-1}$

$\kappa_x$ is called the inner automorphism of $G$ (given) by $x$.

The set of inner automorphisms of $G$ is denoted $\Inn G$ or $\map {\mathscr I} G$.

Also see

 * Inner Automorphism is Automorphism