Constructive Lovász Local Lemma

lax-41·formalized by Édouard Bonnet @EdouardBonnet·registered·created 2026-08-04·GitHub @05704ee·Lean v4.30.0 epoch · mathlib c5ea00351c28

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    Abstract

    This submission formalizes Theorem 1.2 of Moser and Tardos, A Constructive Proof of the General Lovász Local Lemma, and Theorem 2.2 of Haeupler, Saha, and Srinivasan, New Constructive Aspects of the Lovász Local Lemma. For finitely many measurable bad events determined by mutually independent random variables, it proves the asymmetric local-lemma conclusion and the resampling algorithm's expected per-event and total resampling bounds. It also proves that any observed event is true at some stage—and hence in the output distribution—with probability at most its original probability times the inverse local-lemma product over its dependency neighborhood. The proofs use resampling tables, proper witness trees, branching-process weight estimates, and a finite-termination argument.

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    Cite this

    @misc{lax-41,
      author = {Édouard Bonnet},
      title = {Constructive Lovász Local Lemma},
      year = {2026},
      howpublished = {Lax Archive, lax-41},
      url = {https://laxarchive.org/lax-41/},
    }

    References

    1. Robin A. Moser and Gábor Tardos. A Constructive Proof of the General Lovász Local Lemma. Journal of the ACM 57(2):11:1–11:15, 2010. doi:10.1145/1667053.1667060 · doi.org/10.1145/1667053.1667060
    2. Bernhard Haeupler, Barna Saha and Aravind Srinivasan. New Constructive Aspects of the Lovász Local Lemma. Journal of the ACM 58(6):28:1–28:28, 2011. doi:10.1145/2049697.2049702 · doi.org/10.1145/2049697.2049702

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