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  • Mathematical Proceedings of the Cambridge Philosophical Society, Volume 93, Issue 2
  • March 1983, pp. 219-230

The hyperelliptic equation over function fields

  • R. C. Mason (a1)
  • DOI: http://dx.doi.org/10.1017/S0305004100060497
  • Published online: 24 October 2008
Abstract

Siegel, in a letter to Mordell of 1925(9), proved that the hyper-elliptic equation y2 = g(x) has only finitely many solutions in integers x and y, where g denotes a square-free polynomial of degree at least three with integer coefficients. Siegel's method reduces the hyperelliptic equation to a finite set of Thue equations f(x, y) = 1, where f denotes a binary form with algebraic coefficients and at least three distinct linear factors; x and y are integral in a fixed algebraic number field. Siegel had already proved that the Thue equations so obtained have only finitely many solutions. However, as is well known, the work of Siegel is ineffective in that it fails to provide bounds on the integer solutions of y2 = g(x). In 1969 Baker (1), using the theory of linear forms in logarithms, employed Siegel's technique to establish explicit bounds on x and y; Baker's result thus reduced the problem of determining all integer solutions of the hyperelliptic equation to a finite amount of computation.

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(10)B. L. van der Waerden Moderne Algebra, vol. II (Berlin, Springer, 1931).

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Mathematical Proceedings of the Cambridge Philosophical Society
  • ISSN: 0305-0041
  • EISSN: 1469-8064
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