Base-point-freeness conjecture for lc algebraically integrable foliations

Let (X,F,B)/U(X,\mathcal{F},B)/U be an lc algebraically integrable foliated triple. Let AA be an ample/U/U R\mathbb{R}-divisor on XX such that KF+B+AK_{\mathcal{F}}+B+A is nef/U/U. Then:

  1. KF+B+AK_{\mathcal{F}}+B+A is semi-ample/U/U.
  2. If KF+B+AK_{\mathcal{F}}+B+A is Cartier, then OX(m(KF+B+A))\mathcal{O}_X(m(K_{\mathcal{F}}+B+A)) is globally generated/U/U for any integer m0m\gg 0.

Base-point-freeness conjecture. Under these hypotheses, the divisor KF+B+AK_{\mathcal{F}}+B+A is semi-ample/U/U, and in the Cartier case its sufficiently high multiples are globally generated/U/U.

This is the foliated analogue of a base-point-free theorem for lc algebraically integrable foliations. The surrounding results provide positive evidence in locally stable-family and co-rank-one situations, while the general assertion remains open.

Sources & referencesView supporting material

Primary source

Jihao Liu, Fanjun Meng and Lingyao Xie, “Minimal model program for algebraically integrable foliations on klt varieties”, arXiv:2404.01559 (2025).

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