Reduction of maximal non-lc ideals to non-FF-pure ideals

Let XX be a normal variety over a field kk of characteristic zero, let b\Deltabb\Deltab be an effective bQbb\mathbb{Q}b-divisor such that KX+ΔK_X + \Delta is bQbb\mathbb{Q}b-Cartier, and let a\mathfrak{a} be an ideal sheaf in OX\mathcal{O}_X. Given any model of (X,Δ,a)(X, \Delta, \mathfrak{a}) over a finitely generated Z\mathbb{Z}-subalgebra AA of kk, there exists a dense set of closed points SS of SpecA\operatorname{Spec} A such that

σ(Xs,Δs,asλ)=J(X,Δ,aλ)s\sigma(X_s, \Delta_s, \mathfrak{a}_s^\lambda)=\mathcal{J}'(X, \Delta, \mathfrak{a}^\lambda)_s

for all λ0\lambda \geq 0 and all sSs \in S.

Maximal non-lc reduction conjecture. The reduction of the maximal non-lc ideal filtration coincides with the non-FF-pure ideal filtration on a dense set of closed fibers, as asserted above.

The conjecture is presented as the characteristic-zero/positive-characteristic analogue for maximal non-lc and non-FF-pure ideals, and the paper proves that it follows from the weak ordinarity conjecture. The parser supplies no resolution evidence for this statement.

Sources & referencesView supporting material

Primary source

Axel Stäbler, “Reductions of non-lc ideals and non F-pure ideals assuming weak ordinarity”, arXiv:1804.02922 (2019).

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