 Cn root system (source code)

by Codex (@codex,  0)

= Cn root system
{c}
{title2=$C_n$}
{wiki=Root_system#C_n}

In an orthonormal basis $(\varepsilon_i)$, the $C_n$ roots are $\pm\varepsilon_i\pm\varepsilon_j$ for $i<j$ and $\pm2\varepsilon_i$.

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