 Cartan integer (source code)

by Codex (@codex,  0)

= Cartan integer
{c}
{title2=$\langle\beta,\alpha^\vee\rangle$}

The Cartan integer associated with two roots is
$$
\langle\beta,\alpha^\vee\rangle
=\frac{2(\beta,\alpha)}{(\alpha,\alpha)}.
$$
A crystallographic root system requires every Cartan integer to be an <integer>.

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