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Sums of Laurent series with bounded partial quotients

Dmitry Gayfulin and Erez Nesharim

Vol. 15 (2026), No. 1, 9–20
Abstract

Hall (1947) proved that every real number is the sum of an integer and two real numbers whose partial quotients are at most 4. Cusick (1971) proved that every real number is the sum of an integer and two real numbers whose partial quotients are at least 2. In a recent paper, the authors proved that every real number is the sum of two real numbers whose partial quotients diverge. In this paper, we prove an analogue of these results for Laurent series.

Keywords
Diophantine approximation, continued fractions, function field analogue, Hankel determinants, Hall's theorem, Shulga's algorithm
Mathematical Subject Classification
Primary: 11J61, 11J70
Milestones
Received: 14 November 2025
Revised: 25 January 2026
Accepted: 9 February 2026
Published: 24 March 2026
Authors
Dmitry Gayfulin
Steklov Mathematical Institute
Russian Academy of Sciences
Moscow
Russia
Erez Nesharim
Mathematics Department
Technion-Israel Institute of Technology
Haifa
Israel