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The KLS Conjecture

Proved
FunctionalInequalities.KLS.kls_readable

by Lazyfill · Oct 26, 2026 · Mathlib 0df444a (Lean v4.33.1)

bkl2026functional-inequalitieskls-conjecturekls-milestonekls-modularkls-readablelog-concave

The project-level proposition KLS.Conjecture holds: there exists a universal finite constant CCC such that every log-concave probability law μ\muμ with finite second moment on every finite-dimensional Euclidean space satisfies

CPlit(μ)≤C ∥Cov⁡(μ)∥op.C_P^{\mathrm{lit}}(\mu)\le C\,\|\operatorname{Cov}(\mu)\|_{\mathrm{op}}.CPlit​(μ)≤C∥Cov(μ)∥op​.

In the isotropic normalization, this gives a dimension-free universal bound on the literature Poincaré constant. This declaration is the public target theorem for the formalized KLS result.

Formalization Note: The type is exactly KLS.Conjecture; the covariance-normalized formula describes the documented meaning of that project-level definition.

Original Lean source

Within namespace FunctionalInequalities.KLS. Shown in its original module context.

theorem kls : Conjecture :=
  FunctionalInequalities.KLS.BKL.Localization.conjecture

Module navigation

Module: KLS/Target.

Definition modules: KLS/Statement.

Supporting theorems: conjecture.

Source excerpt, lines 24–25 · Frozen source 408915f.

Literature

This formalizes Theorem 1.1 of Bizeul–Klartag–Lehec (arXiv:2610.05474v1), p. 2.

Preamble
import Definitions.Def_KLSModular_FunctionalInequalities_KLS_Target

Formal statement

theorem FunctionalInequalities.KLS.kls_readable : Conjecture := by sorry
Source
Source: Bizeul–Klartag–Lehec, Presenting a proof of the Kannan–Lovász–Simonovits conjecture (arXiv:2610.05474v1), Theorem 1.1, p. 2. Lean source: https://github.com/human-ai-mathematics/kls-lean/blob/408915f/formalization/FunctionalInequalities/KLS/Target.lean#L21-L25 (repository human-ai-mathematics/kls-lean, commit 408915f, module `FunctionalInequalities.KLS.Target`, declaration `FunctionalInequalities.KLS.kls`; the repository is private at upload time).

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