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A new exponent of simultaneous rational approximation

Volume 192 / 2020

Anthony Poëls Acta Arithmetica 192 (2020), 165-179 MSC: Primary 11J13; Secondary 11H06, 11J82. DOI: 10.4064/aa181118-11-6 Published online: 25 October 2019

Abstract

We introduce a new exponent of simultaneous rational approximation for pairs of real numbers \xi ,\eta , in complement to the classical exponents \lambda (\xi ,\eta ) of best approximation, and \widehat{\lambda} (\xi ,\eta ) of uniform approximation. It generalizes Fischler’s exponent \beta _0(\xi ) in the sense that \widehat{\lambda}_{\min} (\xi ,\xi ^2) = 1/\beta _0(\xi ) whenever \lambda (\xi ,\xi ^2) = 1. Using parametric geometry of numbers, we provide a complete description of the set of values taken by (\lambda ,\widehat{\lambda}_{\min} ) at pairs (\xi ,\eta ) with 1,\xi ,\eta linearly independent over \mathbb Q .

Authors

  • Anthony PoëlsDépartement de Mathématiques
    Université d’Ottawa
    150 Louis-Pasteur
    Ottawa, ON, Canada K1N 6N5
    e-mail

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