Source-pinned research

Research proof index

Search theorem names, mathematical ideas, modules, topics, projects, and role-labelled researchers. Open a result for its complete indexed Lean declaration and source record.

This index contains 187 research declarations. Search 10,000 more complete Mathlib declarations.

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Project-declaredLean 4.29.0-rc6

Exists half Ball cover by eighth balls

DeGiorgi.exists_halfBall_cover_by_eighth_balls

Plain-language statement

A specialized quantitative cover tailored to the half-ball / eighth-ball geometry used in the crossover argument.

partial differential equationsregularity theoryanalysis

Source project: DeGiorgi

Person-level attribution pending.

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Project-declaredLean 4.29.0-rc6

Exists smooth compact Support W1p approx univ

DeGiorgi.exists_smooth_compactSupport_W1p_approx_univ

Plain-language statement

Global smooth compactly supported approximation of a compactly supported W^{1,p} function on ℝ^d, in the finite-p regime.

partial differential equationsregularity theoryanalysis

Source project: DeGiorgi

Person-level attribution pending.

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Project-declaredLean 4.29.0-rc6

Exists smooth W12 approx on unit Ball

DeGiorgi.exists_smooth_W12_approx_on_unitBall

Project documentation

specialization of the unit-ball smooth approximation theorem.

partial differential equationsregularity theoryanalysis

Source project: DeGiorgi

Person-level attribution pending.

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Project-declaredLean 4.29.0-rc6

Exists smooth W1p approx on unit Ball

DeGiorgi.exists_smooth_W1p_approx_on_unitBall

Plain-language statement

Sequence form of full W^{1,p} smooth approximation on the unit ball.

partial differential equationsregularity theoryanalysis

Source project: DeGiorgi

Person-level attribution pending.

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Project-declaredLean 4.29.0-rc6

Exists unit Ball cutoff

DeGiorgi.exists_unitBall_cutoff

Plain-language statement

Smooth cutoff: φ = 1 on closedBall 0 1, tsupport ⊆ ball 0 (7/6), range ⊆ [0,1]. Used for the log gradient bound on rescaled cover balls.

partial differential equationsregularity theoryanalysis

Source project: DeGiorgi

Person-level attribution pending.

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Project-declaredLean 4.29.0-rc6

Harnack

DeGiorgi.harnack

Plain-language statement

Positive weak solutions satisfy Harnack on the unit ball.

partial differential equationsregularity theoryanalysis

Source project: DeGiorgi

Person-level attribution pending.

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