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The Diophantine Equation $ x\sp4 + 2 y\sp4 = z\sp4 + 4 w\sp4$

Authors: Andreas-Stephan Elsenhans and Jörg Jahnel
Journal: Math. Comp. 75 (2006), 935-940
MSC (2000): Primary 11Y50; Secondary 14G05, 14J28
Published electronically: December 19, 2005
MathSciNet review: 2197001
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Abstract: We show that, within the hypercube $ \vert x\vert,\vert y\vert,\vert z\vert,\vert w\vert \leq 2.5 \cdot 10\sp6$, the Diophantine equation $ x\sp4 + 2 y\sp4 = z\sp4 + 4 w\sp4$ admits essentially one and only one nontrivial solution, namely $ (\pm1\,484\,801, \pm1\,203\,120, \pm1\,169\,407, \pm1\,157\,520)$. The investigation is based on a systematic search by computer.

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Additional Information

Andreas-Stephan Elsenhans
Affiliation: Mathematisches Institut der Universität Göttingen, Bunsenstraße 3–5, D-37073 Göttingen, Germany

Jörg Jahnel
Affiliation: Mathematisches Institut der Universität Göttingen, Bunsenstraße 3–5, D-37073 Göttingen, Germany

Keywords: $K3$~surface, diagonal quartic surface, rational point, Diophantine equation, computer solution, hashing
Received by editor(s): January 25, 2005
Published electronically: December 19, 2005
Additional Notes: The first author was partially supported by a Doctoral Fellowship of the Deutsche Forschungsgemeinschaft (DFG)
The computer part of this work was executed on the Linux PCs of the Gauß Laboratory for Scientific Computing at the Göttingen Mathematisches Institut. Both authors are grateful to Professor Y. Tschinkel for the permission to use these machines as well as to the system administrators for their support
Article copyright: © Copyright 2005 American Mathematical Society
The copyright for this article reverts to public domain 28 years after publication.

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