One-point covers of elliptic curves and good reduction
Algebraic Geometry
2017-07-31 v1 Number Theory
Abstract
Raynaud gave a criterion for a branched -cover of curves defined over a mixed-characteristic discretely valued field with residue characteristic to have good reduction in the case of either a three-point cover of or a one-point cover of an elliptic curve. Specifically, such a cover has potentially good reduction whenever has a Sylow -subgroup of order and the absolute ramification index of is less than the number of conjugacy classes of order in . In the case of an elliptic curve, we generalize this to the case in which has an arbitrarily large cyclic Sylow -subgroup.
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Cite
@article{arxiv.1707.08996,
title = {One-point covers of elliptic curves and good reduction},
author = {James Phillips},
journal= {arXiv preprint arXiv:1707.08996},
year = {2017}
}
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11 pages