Plane quartics with Jacobians isomorphic to a hyperelliptic Jacobian

Details Plane quartics with Jacobians isomorphic to a hyperelliptic Jacobian Plane quartics with Jacobians isomorphic to a hyperelliptic Jacobian

1998-05-27

arxiv.org/abs/math/9805121v1

Proc. Amer. Math. Soc. 129 (2001) 1647--1657.

Mathematics

Algebraic Geometry

11 pages, AMS-LaTeX

Scientific paper

We show how for every integer n one can explicitly construct n distinct plane quartics and one hyperelliptic curve over the complex numbers all of whose Jacobians are isomorphic to one another as abelian varieties without polarization. When we say that the curves can be constructed ``explicitly'', we mean that the coefficients of the defining equations of the curves are simple rational expressions in algebraic numbers in R whose minimal polynomials over Q can be given exactly and whose decimal approximations can be given to as many places as is necessary to distinguish them from their conjugates. We also prove a simply-stated theorem that allows one to decide whether or not two plane quartics over the complex numbers, each with a pair of commuting involutions, are isomorphic to one another.

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