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\(S\)-integral solutions to a Weierstrass equation. (English) Zbl 0898.11009
The author determines the rational solutions (with a power of \(2\) in the denominator) to the equation \[ y^2 = x^3 - 228 x + 848. \] This is an elliptic curve of rank two. There are a variety of standard techniques to solve this problem: For instance using a reduction to Thue-Mahler equations or using elliptic logarithms (and their \(p\)-adic generalizations). However, in this paper the author takes the novel approach of reduction to four term \(S\)-unit equations of a special form. The author attributes this idea to Y. Bilu.
The approach in the current paper has a number of advantages. One does not need unproved estimates for linear forms in \(p\)-adic elliptic logarithms, nor does one need to reduce to a set of Thue-Mahler equations, which can lead to huge computational problems. In addition, the paper contains a detailed explanation of the calculations performed to solve the equation.

11D25 Cubic and quartic Diophantine equations
11G05 Elliptic curves over global fields
14G05 Rational points
Full Text: DOI EMIS Numdam EuDML
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