Tubular approaches to Baker’s method for curves and varieties

Le Fourn, Samuel

doi:10.2140/ant.2020.14.785

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Tubular approaches to Baker's method for curves and varieties

Samuel Le Fourn

Vol. 14 (2020), No. 3, 763–785

DOI: 10.2140/ant.2020.14.785

Abstract

Baker’s method, relying on estimates on linear forms in logarithms of algebraic numbers, allows one to prove in several situations the effective finiteness of integral points on varieties. In this article, we generalize results of Levin regarding Baker’s method for varieties, and explain how, quite surprisingly, it mixes (under additional hypotheses) with Runge’s method to improve some known estimates in the case of curves by bypassing (or more generally reducing) the need for linear forms in $p$ -adic logarithms. We then use these ideas to improve known estimates on solutions of $S$ -unit equations. Finally, we explain how a finer analysis and formalism can improve upon the conditions given, and give some applications to the Siegel modular variety $A_{2} (2)$ .

Keywords

integral points, Baker's method, Runge's method, $S$-unit equation

Mathematical Subject Classification 2010

Primary: 11G35

Secondary: 11J86

Milestones

Received: 18 February 2019

Revised: 20 August 2019

Accepted: 7 October 2019

Published: 1 June 2020

Authors

Samuel Le Fourn
Institut Fourier Université Grenoble Alpes CNRS Grenoble France

Vol. 14, No. 3, 2020