Dn Dynkin diagram
= Dn Dynkin diagram
{c}
{title2=$D_n$}
For $n\ge4$, the finite <Dynkin diagram> $D_n$ is a simply laced tree with one trivalent vertex and three arms containing $1,1,n-3$ edges. All its <roots> have the same length.
= Dn Dynkin diagram
{c}
{title2=$D_n$}
For $n\ge4$, the finite <Dynkin diagram> $D_n$ is a simply laced tree with one trivalent vertex and three arms containing $1,1,n-3$ edges. All its <roots> have the same length.