Helmke's numerical Fujita freeness conjecture

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Let XX be a smooth projective variety of dimension dim⁡(X)=n\operatorname{dim}(X)=n, and let LL be an ample divisor such that

(Ln)>nn,(L^n)>n^n,

and, for every irreducible cycle Z⊆XZ\subseteq X of dimension dim⁡(Z)=d<n\operatorname{dim}(Z)=d<n,

(Ld⋅Z)≥nd.(L^d\mathbin{\cdot} Z)\geq n^d.

Helmke's numerical Fujita freeness conjecture. Under these conditions, the adjoint divisor

KX+LK_X+L

is globally generated. This numerical version is intended to imply Fujita's freeness statement from numerical positivity conditions and is currently open in general.

References

Primary source

Jiaming Chen, Alex Küronya, Yusuf Mustopa and Jakob Stix, “Convex Fujita numbers are not determined by the fundamental group”, arXiv:2301.06367 (2024).

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