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A Fourier analysis approach to disprove the weak Shanks conjecture
Journal article   Peer reviewed

A Fourier analysis approach to disprove the weak Shanks conjecture

Jeffrey Geronimo and Hugo Woerdeman
Proceedings of the American Mathematical Society, Forthcoming
06 Mar 2026

Abstract

Optimal polynomial approximant (OPA) weak Shanks conjecture hypergeometric function
<p>We derive formulas for the Fourier coefficients of |f |(2), where f(z(1), z(2))= (1-z(1), z(2)/r ), (-alpha ),alpha > 0, in terms of hypergeometric functions. Using these formulas we provide additional counterexamples to the weak Shanks conjecture, which was recently disproven by Beneteau, Khavinson and Seco [Constr. Approx. 62 (2025), pp. 645-661]. The obtained formulas allow for (numerical) optimization over the parameters alpha and r.</p>

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