Bielliptic intermediate modular curves
We determine which of the modular curves X-Delta(N), that is, curves lying between X-0(N) and X-1(N), are bielliptic. Somewhat surprisingly, we find that one of these curves has exceptional automorphisms. Finally we find all X-Delta(N) that have infinitely many quadratic points over Q. (C) 2019 Elsevier B.V. All rights reserved.
- Publisher
- ELSEVIER
- Issue Date
- 2020-01
- Language
- English
- Article Type
- Article
- Citation
JOURNAL OF PURE AND APPLIED ALGEBRA, v.224, no.1, pp.272 - 299
- ISSN
- 0022-4049
- Appears in Collection
- RIMS Journal Papers
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