Math 2.0

definition

Conjugate elements

Definition

Let GG be a group and let a,b∈Ga, b \in G. The element bb is conjugate to aa when there is g∈Gg \in G with b=gag−1b = gag^{-1}. The element gag−1gag^{-1} is called the conjugate of aa by gg.

Remarks

Conjugacy is an equivalence relation on GG; its classes are the conjugacy classes. In an abelian group, gag−1=agag^{-1} = a, so each element is conjugate only to itself. Conjugate elements have the same order. In the group of invertible matrices, conjugate matrices are similar matrices.

Explanations

L1 human

Conjugating aa by gg means: first undo gg, then do aa, then do gg again (reading the product from right to left). The result does the same thing as aa, but in a place that gg has moved. For example, two rotations of a cube by the same angle about different axes are conjugate.

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Sources

  1. Web https://en.wikipedia.org/wiki/Conjugacy_class, Definition