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Local-Density Region Lies In The Measure Support

Proved
FunctionalInequalities.Energy.SmoothGradient.LocalDensity.subset_support_readable

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

functional-inequalitieskls-conjecturekls-modularkls-readablelog-concave

This lemma places the open local-density region inside the support of the probability measure.

Let VVV be a normed additive group with a measurable Borel structure. Let ν\nuν be a probability measure on VVV, let mmm be an additive Haar measure, and let DDD be a SmoothGradient.LocalDensity for (ν,m)(\nu,m)(ν,m). If Ω=D.Ω\Omega=D.\OmegaΩ=D.Ω denotes its designated open density region, then

Ω⊆supp⁡(ν).\Omega\subseteq\operatorname{supp}(\nu).Ω⊆supp(ν).

The declaration is subset_support_readable. No inner-product, completeness, finite-dimensionality, or second-countability assumptions are included in the theorem type. The result is a support-membership fact used by the smooth-gradient density framework.

Original Lean declaration header

Within namespace FunctionalInequalities.Energy.SmoothGradient.LocalDensity. Shown in its original module context. Proof omitted.

theorem subset_support : D.Ω ⊆ (ν : Measure V).support

Module navigation

Module: Energy/SmoothGradient/Core.

Next: Test.exists_domain_sequence_tendsto.

Source excerpt, lines 93–93 · Frozen source 408915f.

Preamble
import Definitions.Def_KLSModular_FunctionalInequalities_Energy_SmoothGradient_Core

open MeasureTheory Filter Topology
universe u
variable {V : Type u} [NormedAddCommGroup V] [InnerProductSpace ℝ V] [CompleteSpace V]
  [MeasurableSpace V] [BorelSpace V] [SecondCountableTopology V] [FiniteDimensional ℝ V]
variable {ν : MeasureTheory.ProbabilityMeasure V} {m : MeasureTheory.Measure V} (D : FunctionalInequalities.Energy.SmoothGradient.LocalDensity ν m)
variable [m.IsAddHaarMeasure]
omit [InnerProductSpace ℝ V] [CompleteSpace V] [SecondCountableTopology V] [FiniteDimensional ℝ V]
Formal statement

theorem FunctionalInequalities.Energy.SmoothGradient.LocalDensity.subset_support_readable : D.Ω ⊆ (ν : Measure V).support := by sorry
Source
Lean source: https://github.com/human-ai-mathematics/kls-lean/blob/408915f/formalization/FunctionalInequalities/Energy/SmoothGradient/Core.lean#L91-L110 (repository human-ai-mathematics/kls-lean, commit 408915f, module `FunctionalInequalities.Energy.SmoothGradient.Core`, declaration `FunctionalInequalities.Energy.SmoothGradient.LocalDensity.subset_support`; the repository is private at upload time).

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