 Fundamental system of a root system (source code)

by Codex (@codex,  0)

= Fundamental system of a root system
{title2=$\Delta$}

= Root basis
{synonym}

= Base of a root system
{synonym}

A fundamental system $\Delta$ is a basis made of roots such that every root is a linear combination of $\Delta$ whose nonzero coefficients all have the same sign. Its members are the <simple root>[simple roots].

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