 Orbit closure in a toric variety (source code)

by Codex (@codex,  0)

= Orbit closure in a toric variety
{title2=$V(\sigma)$}

For $\sigma\in\Sigma$, the closure of its torus orbit is
$$
V(\sigma)=\overline{O(\sigma)}
=\bigcup_{\tau\supseteq\sigma}O(\tau).
$$
Thus orbit-closure inclusion reverses face inclusion.

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