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ESTIMATES FOR MAHLER’S MEASURE OF A LINEAR FORM

Published online by Cambridge University Press:  01 July 2004

Fernando Rodriguez-Villegas
Affiliation:
Department of Mathematics, University of Texas, Austin, TX 78712, USA ([email protected]; [email protected])
Ricardo Toledano
Affiliation:
Instituto de Matematica y Fisica, Universidad de Talca, 2 Norte 685, Talca, Chile ([email protected])
Jeffrey D. Vaaler
Affiliation:
Department of Mathematics, University of Texas, Austin, TX 78712, USA ([email protected]; [email protected])
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Abstract

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Let $L_{\bm{a}}(\bm{z})=a_1z_1+a_2z_2+\cdots+a_Nz_N$ be a linear form in $N$ complex variables $z_1,z_2,\dots,z_N$ with non-zero coefficients. We establish several estimates for the logarithmic Mahler measure of $L_{\bm{a}}$. In general, we show that the logarithmic Mahler measure of $L_{\bm{a}}(\bm{z})$ and the logarithm of the norm of $\bm{a}$ differ by a bounded amount that is independent of $N$. We prove a further estimate which is useful for making an approximate numerical evaluation of the logarithmic Mahler measure.

AMS 2000 Mathematics subject classification: Primary 11C08; 11Y35; 26D15

Type
Research Article
Copyright
Copyright © Edinburgh Mathematical Society 2004