Stein and Watkins conjectured that for a certain family of elliptic curves $E$, the $X_0(N)$-optimal curve and the $X_1(N)$-optimal curve of the isogeny class $\mathcal {C}$ containing $E$ of conductor $N$ differ by a 3-isogeny. In this paper, we show that this conjecture is true.
@article{10_4064_aa158_3_2,
author = {Dongho Byeon and Donggeon Yhee},
title = {Optimal curves differing by a 3-isogeny},
journal = {Acta Arithmetica},
pages = {219--227},
year = {2013},
volume = {158},
number = {3},
doi = {10.4064/aa158-3-2},
language = {en},
url = {http://geodesic.mathdoc.fr/articles/10.4064/aa158-3-2/}
}
TY - JOUR
AU - Dongho Byeon
AU - Donggeon Yhee
TI - Optimal curves differing by a 3-isogeny
JO - Acta Arithmetica
PY - 2013
SP - 219
EP - 227
VL - 158
IS - 3
UR - http://geodesic.mathdoc.fr/articles/10.4064/aa158-3-2/
DO - 10.4064/aa158-3-2
LA - en
ID - 10_4064_aa158_3_2
ER -