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7-Gons and genus three hyperelliptic curves

Revista de la Real Academia de Ciencias Exactas, Fisicas y Naturales - Serie A: Matematicas, ISSN: 1579-1505, Vol: 107, Issue: 1, Page: 35-52
2013
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Article Description

In this paper, we will give a general but completely elementary description for hyperelliptic curves of genus three whose Jacobian varieties have endomorphisms by the real cyclotomic field ℚ(ζ + ζ̄). We study the algebraic correspondences on these curves which are lifts of algebraic correspondences on a conic in P associated with Poncelet 7-gons. These correspondences induce endomorphisms φ on the Jacobians which satisfy φ+φ-2φ-1=0. Moreover, we study Humbert's modular equations which characterize the curves of genus three having these real multiplications. © 2012 Springer-Verlag.

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