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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

Integrable bounded mul bilin Form Integrand

DeGiorgi.integrable_bounded_mul_bilinFormIntegrand

Project documentation

Integrability of a bounded scalar times the bilinear-form integrand. If |f(x)| ≤ C everywhere and the bilinear-form integrand ⟪A∇u,∇u⟫ is integrable (which it always is for u ∈ W^{1,2}), then f · ⟪A∇u,∇u⟫ is integrable. This is a key API lemma for the Caccioppoli/Moser absorption argument. Proved in a standalone context to keep elaboration managea...

partial differential equationsregularity theoryanalysis

Source project: DeGiorgi

Person-level attribution pending.

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Project-declaredLean 4.29.0-rc6

Is Weak Solution sub Datum of dirichlet Problem

DeGiorgi.isWeakSolution_subDatum_of_dirichletProblem

Plain-language statement

A Dirichlet solution lifts to a zero-boundary weak solution for the shifted unknown u - u₀.

partial differential equationsregularity theoryanalysis

Source project: DeGiorgi

Person-level attribution pending.

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Project-declaredLean 4.29.0-rc6

JNBall fivefold subset six Ball

DeGiorgi.JNBall.fivefold_subset_sixBall

Plain-language statement

The five-fold enlargement of a JNBall stays inside the five-fold enlargement of the ambient ball.

partial differential equationsregularity theoryanalysis

Source project: DeGiorgi

Person-level attribution pending.

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Project-declaredLean 4.29.0-rc6

John nirenberg

DeGiorgi.john_nirenberg

Plain-language statement

John-Nirenberg exponential decay from a one-step decay hypothesis on pointwise level sets.

partial differential equationsregularity theoryanalysis

Source project: DeGiorgi

Person-level attribution pending.

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