PomeDefinition 5.19.11.1AA67767FB84 Assume that $\alpha $ is big. The non-nef locus $\operatorname{nn}(\alpha )$ of $\alpha $ is the following set:
\[ \operatorname{nn}(\alpha )\coloneqq \{ x\in X :\nu (T_{\min },x)>0\} , \]
where $T_{\min }$ is a current with minimal singularities in $\alpha $.
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