Boundedness of complements for normalized foliated structures

Let dd be a positive integer, and let Γ[0,1]\Gamma\subset [0,1] be a DCC set of rational numbers whose closure is contained in Q\mathbb Q. A projective R\mathbb R-complementary normalized foliated structure is written as B:=(X,F,B)(t)\mathfrak{B}:=(X,\mathcal{F},B)(t), where XX is of Fano type and tΓt\in\Gamma. Boundedness of complements conjecture. There exists a positive integer NN, depending only on dd and Γ\Gamma, such that every such B\mathfrak{B} admits a monotonic NN-complement B+=(X,F,B+)(t+)B\mathfrak{B}^+=(X,\mathcal{F},B^+)(t^+)\geq\mathfrak{B} satisfying

B+B,t+t,B^+\geq B,\qquad t^+\geq t,

and

Nt+N,NB+ is an integral divisor,NKB+0.Nt^+\in\mathbb N,\qquad NB^+\text{ is an integral divisor},\qquad NK_{\mathfrak{B}^+}\sim 0.

The conjecture is proposed as a foliated analogue of boundedness of complements, motivated by its expected importance in K-stability and K-moduli theory. It is stated as a direction for future work; the source records no resolution.

Sources & referencesView supporting material

Primary source

Paolo Cascini, Jihao Liu, Calum Spicer and Roberto Svaldi, “Birational boundedness of stable families”, arXiv:2604.24106 (2026).

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