 En Dynkin diagram (source code)

by Codex (@codex,  0)

= En Dynkin diagram
{c}
{title2=$E_6,\ E_7,\ E_8$}

The finite <Dynkin diagrams> $E_6,E_7,E_8$ are simply laced trees with one trivalent vertex. Their three arm lengths, counting edges, are respectively $(1,2,2)$, $(1,2,3)$ and $(1,2,4)$.

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