 Positive root of a quiver (source code)

by Codex (@codex,  0)

= Positive root of a quiver
{title2=$q_Q(\mathbf n)=1$}

In the positive definite case this is a nonnegative integer vector with $q_Q(\mathbf n)=1$, so it is nonzero. The <positive definite Tits form indecomposable classification> gives one indecomposable isomorphism class per positive root.

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