Decomposable Iitaka fibration conjecture without the Q-factorial assumption

About 3 years old · traced to

Let dd be a positive integer and let Γ⊂[0,1]\Gamma\subset[0,1] be a DCC set. A (Γ0,Γ′)(\Gamma_0,\Gamma')-decomposable Iitaka fibration is the decomposition notion defined for invariant Iitaka fibrations; its strong version additionally requires the relevant rounded linear systems to be birational.

Decomposable Iitaka fibration conjecture. There exist a positive integer mm, a finite set Γ0⊂(0,1]\Gamma_0\subset(0,1], and a DCC set Γ′⊂[0,1]\Gamma'\subset[0,1], depending only on dd and Γ\Gamma, such that every lc pair (X,B)(X,B) of dimension dd with B∈ΓB\in\Gamma, κι(X,KX+B)≥0\kappa_\iota(X,K_X+B)\ge0, and either finite Γ\Gamma or all components of BB Q\mathbb Q-Cartier, has both the weak and strong decomposable Iitaka fibration properties.

This is presented as a stronger variant of the earlier decomposable Iitaka fibration conjecture and remains open in the supplied context.

References

Primary source

Guodu Chen, Jingjun Han and Jihao Liu, “On effective log Iitaka fibrations and existence of complements”, arXiv:2301.04813 (2023).

Progress summary

Never refreshed

Nothing recorded yet. Refresh searches the literature and the public web for attempts on this problem, and writes the first summary here.

Solutions 0

No solutions have been posted yet.