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Chabauty limits of Fermat spirals

Yohay Ailon Tevet

Vol. 14 (2025), No. 3-4, 239–249
Abstract

A Fermat spiral is a set of points of the form ne2πiαn for α . We prove that the Chabauty limits of Fermat spirals are always closed subgroups of 2, and conclude that no Fermat spirals are dense forests. Furthermore, we show that if α is badly approximable the Chabauty limits are always lattices, for which we give a characterisation.

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Keywords
Chabauty topology, Chabauty limit, Fermat spiral, dense forest, spiral set
Mathematical Subject Classification
Primary: 11J04, 52C05, 52C99
Milestones
Received: 30 June 2025
Revised: 26 August 2025
Accepted: 10 September 2025
Published: 24 October 2025
Authors
Yohay Ailon Tevet
Tel Aviv University
Tel Aviv
Israel