THE BIRATIONAL GEOMETRY OF THE MODULI SPACES OF …
ample if and only if Ddim(V) V >0 for every subvariety V X. Consequently, being ample is a numerical condition. The set of ample divisors in N1(X) forms an open convex cone called the ample cone Amp(X). Being nef is evidently numerical. The set of nef divisors in N1(X) forms a …