Source-pinned research

Research proof index

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This index contains 146 research declarations. Search 10,000 more complete Mathlib declarations.

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Project-declaredLean 4.29.0-rc6

Dirichlet Problem unique of divergence Data

DeGiorgi.dirichletProblem_unique_of_divergenceData

Plain-language statement

Inhomogeneous Dirichlet solutions are unique up to a.e. equality.

partial differential equationsregularity theoryanalysis

Source project: DeGiorgi

Person-level attribution pending.

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Project-declaredLean 4.29.0-rc6

Divergence RHSOf Field add

DeGiorgi.divergenceRHSOfField_add

Plain-language statement

The divergence-form RHS is additive in the test slot.

partial differential equationsregularity theoryanalysis

Source project: DeGiorgi

Person-level attribution pending.

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Project-declaredLean 4.29.0-rc6

Divergence RHSOf Field bound

DeGiorgi.divergenceRHSOfField_bound

Plain-language statement

The divergence-form RHS is bounded with respect to the gradient seminorm.

partial differential equationsregularity theoryanalysis

Source project: DeGiorgi

Person-level attribution pending.

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Project-declaredLean 4.29.0-rc6

Du bois reymond

DeGiorgi.du_bois_reymond

Project documentation

Du Bois-Reymond lemma: if g ∈ L^1(a,b) and ∫ g · φ' = 0 for all smooth compactly supported φ in (a,b), then g is constant a.e. Proof (Evans, Appendix C): fix ψ₀ ∈ C_c^∞(a,b) with ∫ψ₀ = 1, set c = ∫g·ψ₀. For any test η, decompose η = [η - (∫η)·ψ₀] + (∫η)·ψ₀. The first part has zero integral, hence is φ' for some test φ (antideri...

partial differential equationsregularity theoryanalysis

Source project: DeGiorgi

Person-level attribution pending.

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Project-declaredLean 4.29.0-rc6

Mixed bound

DeGiorgi.EllipticCoeff.mixed_bound

Plain-language statement

Mixed bilinear bound needed by the variational branch.

partial differential equationsregularity theoryanalysis

Source project: DeGiorgi

Person-level attribution pending.

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Project-declaredLean 4.29.0-rc6

Mul Vec sq le

DeGiorgi.EllipticCoeff.mulVec_sq_le

Plain-language statement

Mixed quadratic bound derived from inverse coercivity.

partial differential equationsregularity theoryanalysis

Source project: DeGiorgi

Person-level attribution pending.

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