Hostname: page-component-745bb68f8f-l4dxg Total loading time: 0 Render date: 2025-02-06T04:57:49.408Z Has data issue: false hasContentIssue false
  • English
  • Français

THE DIOPHANTINE EQUATION $\boldsymbol{x}^{\boldsymbol{4}} \boldsymbol{+} \boldsymbol{2}^{\boldsymbol{n}}\boldsymbol{y}^{\boldsymbol{4}} \boldsymbol{=} \boldsymbol{1}$ IN QUADRATIC NUMBER FIELDS

Part of: Algebraic number theory: global fields Diophantine equations

Published online by Cambridge University Press:  06 November 2020

ANDREW LI Open the ORCID record for ANDREW LI [Opens in a new window]
ANDREW LI*
Affiliation:
Department of Mathematics, University of Nebraska Omaha, Omaha, NE68182, USA
*
e-mail: ali01@unomaha.edu
Rights & Permissions [Opens in a new window]

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

Aigner showed in 1934 that nontrivial quadratic solutions to $x^4 + y^4 = 1$ exist only in $\mathbb Q(\sqrt {-7})$ . Following a method of Mordell, we show that nontrivial quadratic solutions to $x^4 + 2^ny^4 = 1$ arise from integer solutions to the equations $X^4 \pm 2^nY^4 = Z^2$ investigated in 1853 by V. A. Lebesgue.

Keywords

quartic Diophantine equationsquadratic number fields

MSC classification

Primary: 11D25: Cubic and quartic equations
Secondary: 11R11: Quadratic extensions 11D45: Counting solutions of Diophantine equations
Type
Research Article
Information
Bulletin of the Australian Mathematical Society , Volume 104 , Issue 1 , August 2021 , pp. 21 - 28
Check for updates
Copyright
© 2020 Australian Mathematical Publishing Association Inc.

References

Aigner, A., ‘Über die möglichkeit von ${x}^4+{y}^4={z}^4$ in quadratischen körpern’, Jahresber. Dtsch. Math.-Ver. 43 (1934), 226–229.Google Scholar
Faddeev, D. K., ‘Group of divisor classes on the curve defined by the equation ${x}^4+{y}^4=1$ ’, Soviet Math. Dokl. 1 (1960), 1149–1151.Google Scholar
Lebesgue, V. A., ‘Résolution des équations biquadratiques (1), (2) ${z}^2={x}^4\pm {2}^m{y}^4$ , (3) ${z}^2={2}^m{x}^4-{y}^4$ , (4), (5) ${2}^m{z}^2={x}^4\pm {y}^4$ ’, J. Math. Pures Appl. 18 (1853), 73–86. https://archive.org/details/s1journaldemat18liou/page/72/mode/2up.Google Scholar
Manley, E. D., ‘On quadratic solutions of ${x}^4+p{y}^4={z}^4$ ’, Rocky Mountain J. Math. 36(3) (2006), 1027–1031.Google Scholar
Mordell, L. J., ‘The Diophantine equation ${x}^4+{y}^4=1$ in algebraic number fields’, Acta Arith. 14 (1967/68), 347–355.CrossRefGoogle Scholar
The LMFDB Collaboration, ‘The L-functions and modular forms database’, http://www.lmfdb.org, (online; accessed 28 July 2020). Google Scholar