Foliated complement conjecture

Let (X/Zz,F,B)(X/Z\ni z,\mathcal{F},B) be an (ϵ,R)(\epsilon,\mathbb{R})-complementary foliated triple of dimension dd, with coefficients in a DCC set Γ[0,1]\Gamma\subset[0,1]. An (ϵ,n)(\epsilon,n)-complement is the corresponding bounded complement with index nn.

Foliated complement conjecture. For every positive real number ϵ\epsilon and positive integer dd, there exists a positive real number nn depending only on ϵ\epsilon, dd and Γ\Gamma such that, if either ϵ=0\epsilon=0 or KF-K_{\mathcal{F}} is big over ZZ, then (X/Zz,F,B)(X/Z\ni z,\mathcal{F},B) has an (ϵ,n)(\epsilon,n)-complement. Moreover, if ΓˉQ\bar\Gamma\subset\mathbb Q, it has a monotonic (ϵ,n)(\epsilon,n)-complement.

This is the foliated analogue of Shokurov's boundedness of complements conjecture. It is known for ordinary pairs in several cases, including dimension two and certain Fano-type settings, while the foliated conjecture remains open in general.

Sources & referencesView supporting material

Primary source

Jihao Liu, Fanjun Meng and Lingyao Xie, “Complements, index theorem, and minimal log discrepancies of foliated surface singularities”, arXiv:2305.06493 (2024).

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