5.1 – Aut | Initial chamber

VITAL REQUIREMENT

Knowledge of an initial ${\mathcal{P}}_{\mathbb{L}}$-chamber ${\mathcal{D}}_0$
Having the $\iota (S)$-nondegeneracy property, i.e., inducing
a ${\mathcal{P}}_S$-chamber $$D_0={\mathcal{D}}_0\cap {\mathcal{P}}_S$$ such that $D_0\subset \text{Nef}(X)\cap {\mathcal{P}}_S$.

---