Lie group, derived
The commutator subgroup of a Lie group. For any Lie group $G$ its derived Lie group $[G,G]$ is a normal (not necessarily closed) Lie subgroup of $G$. The corresponding ideal of the Lie algebra $\mathfrak g$ of the group $G$ coincides with the commutator algebra $[\mathfrak g,\mathfrak g]$ (also called the derived Lie algebra of $\mathfrak g$). The commutator subgroup of a simply-connected (or connected linear) Lie group $G$ is always closed in $G$.
|||C. Chevalley, "Theory of Lie groups" , 1 , Princeton Univ. Press (1946)|
Lie group, derived. Encyclopedia of Mathematics. URL: http://www.encyclopediaofmath.org/index.php?title=Lie_group,_derived&oldid=32088