The codimension-one-nef formulation of the numerical-dimension conjecture
Let be a projective manifold, let be an irreducible curve with ample normal sheaf, and let be an -divisor which is nef in codimension .
Codimension-one-nef formulation. If
then
The source presents this as an equivalent formulation of the conjecture that a pseudo-effective line bundle orthogonal to a curve with ample normal sheaf has numerical dimension zero, via divisorial Zariski decomposition. It remains open in general.
References
Primary source
Thomas Peternell, “Compact subvarieties with ample normal bundles, algebraicity and cones of cycles”, arXiv:1106.4433 (2011).
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