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Pàgina inicial > Articles > Articles publicats > Bielliptic modular curves X0* (N) with square-free levels |
Data: | 2019 |
Resum: | Let N ≥ 1 be a square-free integer such that the modular curve X0*(N) has genus ≥ 2. We prove that X 0*(N) is bielliptic exactly for 19 values of N, and we determine the automorphism group of these bielliptic curves. In particular, we obtain the first examples of nontrivial Aut(X0*(N)) when the genus of X0*(N) is ≥ 3. Moreover, we prove that the set of all quadratic points over ℚ for the modular curve X0*(N) with genus ≥ 2 and N square-free is not finite exactly for 50 values of N. |
Ajuts: | Ministerio de Economía y Competitividad MTM2012-34611 Ministerio de Economía y Competitividad MTM2016-75980-P Ministerio de Economía y Competitividad MDM-2014-0445 |
Drets: | Tots els drets reservats. |
Llengua: | Anglès |
Document: | Article ; recerca ; Versió sotmesa a revisió |
Publicat a: | Mathematics of Computation, Vol. 88, Issue 320 (April 2019) , p. 2939-2957, ISSN 1088-6842 |
Preprint 20 p, 518.4 KB |