English

A basepoint free theorem for algebraically integrable foliations

Algebraic Geometry 2023-11-21 v2

Abstract

We show that if F\mathcal{F} is an algebraically integrable foliation on a Q\mathbb{Q}-factorial normal projective variety XX, A,B0 A, B \geq 0 are Q\mathbb{Q}-divisors on XX with AA ample such that (F,B)(\mathcal{F}, B) is foliated dlt and KF+A+BK_{\mathcal{F}}+ A+B is nef, then KF+A+BK_{\mathcal{F}}+A+B is semiample. We also provide some applications of this and related results such as contraction theorem for F-dlt pairs and a special case of the b-semiampleness conjecture.

Keywords

Cite

@article{arxiv.2307.03530,
  title  = {A basepoint free theorem for algebraically integrable foliations},
  author = {Priyankur Chaudhuri and Omprokash Das},
  journal= {arXiv preprint arXiv:2307.03530},
  year   = {2023}
}

Comments

This replaces the preliminary version which appeared in July, 2023. There were issues with Lemma 2.4 and Theorem 3.5 of that version which are fixed here. Main results mostly unchanged. Some proofs modified and expanded

R2 v1 2026-06-28T11:24:29.116Z