Moody, D.
and Juyal, A.
(2021),
ON THE FAMILY OF ELLIPTIC CURVES X + 1/X + Y + 1/Y + t = 0, INTEGERS, The electronic journal of combinatorial number theory, [online], https://doi.org/10.5281/zenodo.10807511, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=931852
(Accessed October 12, 2025)
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ON THE FAMILY OF ELLIPTIC CURVES X + 1/X + Y + 1/Y + t = 0
Published
Author(s)
, Abhishek Juyal
Abstract
We study various properties of the family of elliptic curves x+ 1/x+y+ 1/y+t = 0, which is isomorphic to the Weierstrass curve E_t: Y^2=X(X^2+(t^2/4-2)X+1). This equation arises from the study of the Mahler measure of polynomials. We show that the rank of Et(Q(t)) is 0 and the torsion subgroup of Et(Q(t)) is isomorphic to Z/4Z. Over the rational field Q we obtain infinite subfamilies of ranks (at least) one and two, and find specific instances of Et with rank 5 and 6. We also determine all possible torsion subgroups of Et(Q) and conclude with some results regarding integral points in arithmetic progression on Et.Citation
INTEGERS, The electronic journal of combinatorial number theory
Volume
21
Pub Type
Journals
Download Paper
Keywords
Elliptic Curves, Mahler measure, Rank
Citation
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Created March 23, 2021, Updated April 8, 2024