Vol. 9, No. 4, 2020

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Effective simultaneous rational approximation to pairs of real quadratic numbers

Yann Bugeaud

Vol. 9 (2020), No. 4, 353–360

Let ξ, ζ be quadratic real numbers in distinct quadratic fields. We establish the existence of effectively computable, positive real numbers τ and c such that, for every integer q with q > c, we have

max{qξ,qζ} > q1+τ,

where denotes the distance to the nearest integer.

To the memory of Naum Ilich Feldman (1918–1994)

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simultaneous approximation, Pell equation, linear form in logarithms
Mathematical Subject Classification 2010
Primary: 11J13
Secondary: 11D09, 11J86
Received: 29 July 2019
Revised: 9 March 2020
Accepted: 23 March 2020
Published: 5 November 2020
Yann Bugeaud
Institut de Recherche Mathématique Avancée, UMR 7501
Université de Strasbourg et CNRS