Closed cone of curves
= Closed cone of curves
{title2=$\overline{\operatorname{NE}}(X)$}
The closed cone of curves is the closure in $N_1(X)_{\mathbb R}$ of the <convex cone> generated by classes of integral curves. A <nef divisor> pairs nonnegatively with this entire closed cone. Its boundary can contain limiting classes which are not represented by one curve.