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Counterexamples to the inhomogeneous Duffin-Schaeffer Conjecture

Manuel Hauke-Treuer, James Maynard, Andrew Pollington

Source record

Source: arXiv

Published: Sep 25, 2026

arXiv: 2609.30921

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Source abstract

The Duffin-Schaeffer Conjecture, proven in 2020, gives a zero-full dichotomy for the approximation of irrational numbers with reduced fractions for arbitrary approximation functions. We construct approximation functions such that the inhomogeneous analogue of the Duffin-Schaeffer Conjecture fails. The counterexamples are obtained for all non-zero rationals and certain Liouville numbers.

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Counterexamples to the inhomogeneous Duffin-Schaeffer Conjecture — Mathematical Frontier Network