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New irrationality measures for -logarithms
Authors:Tapani Matala-aho   Keijo Vä  ä    nen   Wadim Zudilin.
Affiliation:Department of Mathematical Sciences, University of Oulu, P.O. Box 3000, 90014 Oulu, Finland ; Department of Mathematical Sciences, University of Oulu, P.O. Box 3000, 90014 Oulu, Finland ; Department of Mechanics and Mathematics, Moscow Lomonosov State University, Vorobiovy Gory, GSP-2, 119992 Moscow, Russia
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

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

when $ p=1/qin mathbb{Z}setminus {0,pm 1}$ and $ zin mathbb{Q}$.

Keywords:
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