Ideal of a Lie algebra
= Ideal of a Lie algebra
{wiki=Ideal_(ring_theory)#Lie_algebra_ideals}
A vector subspace $I\subseteq\mathfrak g$ is an ideal when $[\mathfrak g,I]\subseteq I$. It is therefore the kernel of a Lie-algebra quotient map.
= Ideal of a Lie algebra
{wiki=Ideal_(ring_theory)#Lie_algebra_ideals}
A vector subspace $I\subseteq\mathfrak g$ is an ideal when $[\mathfrak g,I]\subseteq I$. It is therefore the kernel of a Lie-algebra quotient map.