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New irrationality measures for $ q$-logarithms

Authors: Tapani Matala-aho, Keijo Väänänen and Wadim Zudilin
Journal: Math. Comp. 75 (2006), 879-889
MSC (2000): Primary 11J82, 33D15
Published electronically: December 20, 2005
MathSciNet review: 2196997
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Abstract | References | Similar Articles | Additional Information

Abstract: The three main methods used in diophantine analysis of $ q$-series are combined to obtain new upper bounds for irrationality measures of the values of the $ q$-logarithm function

$\displaystyle \ln _{q}(1-z)=\sum _{\nu =1}^{\infty }\frac{z^{\nu }q^{\nu }}{1-q^{\nu }}, \qquad \vert z\vert\leqslant 1,$

when $ p=1/q\in \mathbb{Z}\setminus \{0,\pm 1\}$ and $ z\in \mathbb{Q}$.

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Additional Information

Tapani Matala-aho
Affiliation: Department of Mathematical Sciences, University of Oulu, P.O. Box 3000, 90014 Oulu, Finland

Keijo Väänänen
Affiliation: Department of Mathematical Sciences, University of Oulu, P.O. Box 3000, 90014 Oulu, Finland

Wadim Zudilin
Affiliation: Department of Mechanics and Mathematics, Moscow Lomonosov State University, Vorobiovy Gory, GSP-2, 119992 Moscow, Russia

Received by editor(s): June 16, 2004
Received by editor(s) in revised form: March 10, 2005
Published electronically: December 20, 2005
Additional Notes: This work is supported by an Alexander von Humboldt research fellowship and partially supported by grant no. 03-01-00359 of the Russian Foundation for Basic Research
Article copyright: © Copyright 2005 American Mathematical Society

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