The Diophantine Equation y2−k=x3
The Diophantine Equation y2−k=x3
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丢番图方程 y2−k=x3
DOI:
10.1112/plms/s2-13.1.60
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发表时间:
--
影响因子:
1.8
通讯作者:
L. Mordell
中科院分区:
文献类型:
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作者:
L. Mordell
1. This equation was brought into prominence by Fermat,* who had proposed as a problem to the English mathematicians, to shew that there was only one integral solution of the equation?/2-f 2= xB. Concerning this he I says:" Peut on trouver en nombres en tiers un carre autre que 25, qui, augments de 2, fasse un cube'? A la premiere vue cela parait d'une recherche difficile, en fractions une infinite de nombres se de* duisent de la me" thode de Bachet; mais la doctrine des nombres entiers, qui est assur6ment tres-belle et tres-subtile, n'a 6t6 cultivee ni par Bachet, ni par aucun autre dont les ecrits venus jusqu'a moi." He did not publish his method, which is not known at present. We shall consider the equation from three points of view. Firstly, we shall find general formulae for k, for which there are no solutions (we consider integral values only of the unknowns throughout our paper); secondly, we shall apply ideal numbers; and, finally, we shall make use of the arithmetical theory of the binary cubic. In a series of notes and papers published by Lebesgue, t Gerono, § Jonquieres, Realis, r and Pepin,** tt various values and formulee have been given for k for which our equation is insoluble. These results can be considerably extended. Moreover, the same method supplies us with a very useful tentative method for solving such equations, t+