Walsh Analysis in the Twenty-First Century: Convergence, Summability, Nonlinear Approximation, Universality, and Digital Applications

Sergo A. Episkoposian

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arXiv · 2611.09010

Walsh Analysis in the Twenty-First Century: Convergence, Summability, Nonlinear Approximation, Universality, and Digital Applications

Sergo A. Episkoposian

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Abstract

Walsh analysis connects ordered Fourier convergence, summability, nonlinear approximation, and universal representation through a common character algebra. This survey examines developments from 2000-2026 against their classical foundations. Binary kernel geometry explains Hardy-space losses and summability thresholds; interval and packet methods control spectral selection; localized blocks produce correction and universal representations with distinct coefficient and exceptional-set requirements. Selected proofs and counterexamples compare these mechanisms and identify where an implication needs an additional hypothesis. The same distinctions organize digital integration, sparse measurements, Boolean spectra, and generalized Walsh bases. Quantitative thresholds, source conventions, and published theorem pointers are collected in comparative tables. The concluding problems separate source-listed questions, proposed refinements, and elementary obstructions. Supplementary derivations preserve normalization checks and finite covariance calculations while keeping the main exposition focused on the analytic mechanisms.

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BibTeX RIS

Sergo A. Episkoposian. 2026-11-06. Walsh Analysis in the Twenty-First Century: Convergence, Summability, Nonlinear Approximation, Universality, and Digital Applications. https://arxiv.org/abs/2611.09010

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