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Project-declaredLean 4.32.0

Hilbert kernel regularity main part

Hilbert_kernel_regularity_main_part

Plain-language statement

For 0<y10<y\le1 and y/2y1y/2\le y'\le1, with both yy and yy' nonnegative, the negative-side Hilbert kernel satisfies the quantitative regularity estimate

k(y)k(y)261yyyy.\lVert k(-y)-k(-y')\rVert \le 2^6\,\frac{1}{|y|}\,\frac{|y-y'|}{|y|}.

harmonic analysisFourier analysismeasure theory

Source project: Carleson formalization

Person-level attribution pending.

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