Class invariants for quartic CM fields

Details Class invariants for quartic CM fields Class invariants for quartic CM fields

2004-04-21

arxiv.org/abs/math/0404378v2

Mathematics

Number Theory

14 pages

Scientific paper

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.

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