Li's Γ\Gamma-effective adjunction conjecture

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Let dd be a positive integer and let Γ⊂[0,1]\Gamma\subset [0,1] be a DCC set of real numbers. A Γ\Gamma-base-point-free bb-divisor D\mathbf{D} on a normal projective variety XX is one for which there exist a1,…,ak∈Γa_1,\ldots,a_k\in\Gamma and base-point-free bb-divisors D1,…,Dk\mathbf{D}_1,\ldots,\mathbf{D}_k such that

∑i=1kai=1,D=∑i=1kaiDi.\sum_{i=1}^k a_i=1,\qquad \mathbf{D}=\sum_{i=1}^k a_i\mathbf{D}_i.

Let f:(X,B)→Zf:(X,B)\rightarrow Z be an lc-trivial fibration with dim⁡X−dim⁡Z=d\dim X-\dim Z=d, whose horizontal/Z/Z coefficients belong to Γ\Gamma, and let M\mathbf{M} be its moduli part. Li's conjecture. There exist a positive integer II and a finite set Γ0⊂(0,1]\Gamma_0\subset(0,1], depending only on dd and Γ\Gamma, such that IMI\mathbf{M} is Γ0\Gamma_0-base-point-free. This is a stronger irrational-coefficient variation of the Prokhorov–Shokurov conjecture; the paper establishes the equivalence of the two effective adjunction conjectures, but the supplied text does not state that this conjecture itself is resolved.

References

Primary source

Jingjun Han, Jihao Liu and Qingyuan Xue, “On the equivalence between the effective adjunction conjectures of Prokhorov-Shokurov and of Li”, arXiv:2312.15397 (2023).

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