Helmke's numerical Fujita freeness conjecture

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 ZXZ\subseteq X of dimension dim(Z)=d<n\operatorname{dim}(Z)=d<n,

(LdZ)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.

Sources & referencesView supporting material

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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