Class invariants for quartic CM fields
Number Theory
2007-05-23 v2 Algebraic Geometry
Abstract
One can define class invariants for a quartic primitive CM field K as special values of certain Siegel (or Hilbert) modular functions at CM points corresponding to K. We provide explicit bounds on the primes appearing in the denominators of these algebraic numbers. This allows us, in particular, to construct S-units in certain abelian extensions of K, where S is effectively determined by K. It also yields class polynomials for primitive quartic CM fields whose coefficients are S-integers.
Cite
@article{arxiv.math/0404378,
title = {Class invariants for quartic CM fields},
author = {Eyal Z. Goren and Kristin E. Lauter},
journal= {arXiv preprint arXiv:math/0404378},
year = {2007}
}
Comments
14 pages