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arXiv · 2605.30645

A Modern Functional Analytic Tour of the Fourier-Bessel Transform

Cameron L. Williams
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Abstract

In this paper, we review the theory of the Fourier--Bessel transform. The Fourier--Bessel transform is an integral transform on the half-line that generalizes the Fourier cosine transform and is dependent upon a parameter $\nu > -1$. Many of the standard results for the Fourier--Bessel transform have become folklore results and are difficult to find single sources for or predate modern functional analysis and instead rely on hard analysis techniques that miss the elegance of more modern machinery. This review aims to centralize much of the basic theory while providing some new proofs and approaches that can be applied to other integral transforms beyond the Fourier and Fourier--Bessel transform. Particular care is taken to illustrate the distinctions in the theory of the Fourier--Bessel transform when $-1 < \nu < -\frac{1}{2}$ and $-\frac{1}{2} < \nu$.

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BibTeXRIS

Cameron L. Williams. 2026-05-28. A Modern Functional Analytic Tour of the Fourier-Bessel Transform. https://arxiv.org/abs/2605.30645

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