The codimension-one-nef formulation of the numerical-dimension conjecture

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Let XX be a projective manifold, let C⊂XC\subset X be an irreducible curve with ample normal sheaf, and let LL be an R\mathbb{R}-divisor which is nef in codimension 11.

Codimension-one-nef formulation. If

L⋅C=0,L\cdot C=0,

then

L≡0.L\equiv 0.

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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