Available in electronic format
Available in print format
Transacrions of the American Mathematical Society
Transactions of the American Mathematical Society
ISSN 1088-6850(e) ISSN 0002-9947(p)
     

Torsion subgroups of elliptic curves in short Weierstrass form

Author(s): Michael A. Bennett; Patrick Ingram
Journal: Trans. Amer. Math. Soc. 357 (2005), 3325-3337.
MSC (2000): Primary 11G05, 11J68
Posted: March 10, 2005
Retrieve article in: PDF DVI PostScript

Abstract | References | Similar articles | Additional information

Abstract: In a recent paper by M. Wieczorek, a claim is made regarding the possible rational torsion subgroups of elliptic curves $E/\mathbb{Q} $ in short Weierstrass form, subject to certain inequalities for their coefficients. We provide a series of counterexamples to this claim and explore a number of related results. In particular, we show that, for any $\varepsilon>0$, all but finitely many curves

\begin{displaymath}E_{A,B} \; : \; y^2 = x^3 + A x + B, \end{displaymath}

where $A$ and $B$ are integers satisfying $A>\vert B\vert^{1+\varepsilon}>0$, have rational torsion subgroups of order either one or three. If we modify our demands upon the coefficients to $\vert A\vert>\vert B\vert^{2+\varepsilon}>0$, then the $E_{A,B}$ now have trivial rational torsion, with at most finitely many exceptions, at least under the assumption of the abc-conjecture of Masser and Oesterlé.


References:

1.
Y. Bugeaud and K. Gyory,
Bounds for the solutions of Thue-Mahler equations and norm form equations,
Acta Arith. 74 (1996), 273-292. MR 1373714 (97b:11046)

2.
A. Dabrowski and M. Wieczorek,
Families of elliptic curves with trivial Mordell-Weil group,
Bull. Austral. Math. Soc. 62 (2000), 303-306. MR 1786212 (2001f:11085)

3.
A.Y. Khinchin,
Continued Fractions,
Dover Publications, New York, 1964. MR 1451873 (98c:11008)

4.
D. Kubert,
Universal bounds on the torsion of elliptic curves,
Proc. London Math. Soc. 33 (1976), 193-237. MR 0434947 (55:7910)

5.
B. Mazur,
Modular curves and the Eisenstein ideal,
Inst. Hautes Études Sci. Publ. Math. 47 (1977), 33-186. MR 0488287 (80c:14015)

6.
K. Roth,
Rational approximations to algebraic numbers,
Mathematika 2 (1955), 1-20. MR 0072182 (17:242d)

7.
J. Silverman,
The Arithmetic of Elliptic Curves, Graduate Texts in Mathematics 106,
Springer-Verlag, New York 1986. MR 0817210 (87g:11070)

8.
H. Stark,
Effective estimates of solutions of some Diophantine equations,
Acta Arith. 24 (1973), 251-259. MR 0340175 (49:4931)

9.
M. Wieczorek,
Torsion points on certain families of elliptic curves,
Canad. Math. Bull. 46 (2003), 157-160. MR 1955623 (2004b:11081)


Similar Articles:

Retrieve articles in Transactions of the American Mathematical Society with MSC (2000): 11G05, 11J68

Retrieve articles in all Journals with MSC (2000): 11G05, 11J68


Additional Information:

Michael A. Bennett
Affiliation: Department of Mathematics, University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z4

Patrick Ingram
Affiliation: Department of Mathematics, University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z4

DOI: 10.1090/S0002-9947-05-03629-9
PII: S 0002-9947(05)03629-9
Received by editor(s): December 20, 2003
Received by editor(s) in revised form: February 15, 2004
Posted: March 10, 2005
Copyright of article: Copyright 2005, American Mathematical Society


  AMS Website Logo Small Comments: webmaster@ams.org
© Copyright 2008, American Mathematical Society
Privacy Statement
Search the AMSPowered by Google