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- Title
Elliptic normal curves of even degree and theta functions.
- Authors
Kaneko, Masanobu; Kuwata, Masato
- Abstract
An elliptic curve E can be immersed in P N - 1 as a curve of degree N by means of the linear system of |NO|, where O is the origin of E. Well-known classical results going back to Bianchi and Klein say that if N is odd, this immersion is uniquely determined by specifying a full-level N structure. In this paper we show that if N is even, uniqueness of immersion is ensured by specifying a level structure associated with a certain congruence subgroup between Γ (N) and Γ (2 N) . Moreover, we construct, over the complex number field, an immersion by means of suitably chosen theta functions, and write down the quadratic equations satisfied by them.
- Subjects
ELLIPTIC curves; COMPLEX numbers; LINEAR systems; THETA functions; IMMERSIONS (Mathematics); QUADRATIC equations
- Publication
Research in Number Theory, 2024, Vol 10, Issue 3, p1
- ISSN
2522-0160
- Publication type
Article
- DOI
10.1007/s40993-024-00547-0