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 130 research declarations. Search 10,000 more complete Mathlib declarations.

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Project-declaredLean 4.32.0

Dirichlet Kernel eq

dirichletKernel_eq

Plain-language statement

At every real xx for which eix1e^{ix}\ne1, the finite-sum definition of the NNth Dirichlet kernel agrees with the project’s closed-form expression:

DN(x)=DN(x).D_N(x)=D'_N(x).

harmonic analysisFourier analysismeasure theory

Source project: Carleson formalization

Person-level attribution pending.

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Project-declaredLean 4.32.0

Discrete carleson

discrete_carleson

Plain-language statement

There is a measurable exceptional set GGG'\subseteq G with 2μ(G)μ(G)2\mu(G')\le\mu(G) such that every measurable ff bounded by 1F\mathbf{1}_F satisfies

GG+CarlesonSumf(x)dxC(a,q)μ(G)11/qμ(F)1/q.\int_{G\setminus G'}^+\lVert\operatorname{CarlesonSum}f(x)\rVert\,dx\le C(a,q)\mu(G)^{1-1/q}\mu(F)^{1/q}.

harmonic analysisFourier analysismeasure theory

Source project: Carleson formalization

Person-level attribution pending.

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Project-declaredLean 4.32.0

DκZ le two rpow 100

DκZ_le_two_rpow_100

Plain-language statement

The project’s structural constants are chosen so that the scale-separation factor has the fixed quantitative bound

DκZ2100.D^{-\kappa Z}\le2^{-100}.

harmonic analysisFourier analysismeasure theory

Source project: Carleson formalization

Person-level attribution pending.

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Project-declaredLean 4.32.0

E Lp Norm cz Operator restrict two three of support subset

eLpNorm_czOperator_restrict_two_three_of_support_subset

Plain-language statement

The operator czOperator K r is bounded from L^2 ([1, 4]) to L^2 ([2, 3]), uniformly in r. This follows from the fact, proved in norm_czOperator_le_add, that it is bounded by the sum of two operators which are both bounded: one is the convolution with dirichletApprox, bounded as it is an average of Fourier projections, and the other one has a k...

harmonic analysisFourier analysismeasure theory

Source project: Carleson formalization

Person-level attribution pending.

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Project-declaredLean 4.32.0

EnumΘ'Arg Max eq iff

enumΘ'ArgMax_eq_iff

Plain-language statement

Among the first n+1n+1 enumerated phases, enumΘ'ArgMax returns the smallest index ii at which the function gg attains its maximum at xx. Equivalently, every index jnj\le n has value at most the value at ii, and every earlier index j<ij<i has strictly smaller value.

harmonic analysisFourier analysismeasure theory

Source project: Carleson formalization

Person-level attribution pending.

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Project-declaredLean 4.32.0

Eq bi Union iterated Maximal Subfamily

eq_biUnion_iteratedMaximalSubfamily

Plain-language statement

Any set of tiles can be written as the union of disjoint subfamilies, their number being controlled by the maximal stack size.

harmonic analysisFourier analysismeasure theory

Source project: Carleson formalization

Person-level attribution pending.

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