Computing ideal classes representatives in quaternion algebras

Details Computing ideal classes representatives in quaternion algebras Computing ideal classes representatives in quaternion algebras

2010-07-16

arxiv.org/abs/1007.2821v4

Mathematics

Number Theory

Corrected version. Section 4 has been rewritten from scratch

Scientific paper

Let $K$ be a totally real number field and let $B$ be a totally definite quaternion algebra over $K$. In this article, given a set of representatives for ideal classes for a maximal order in $B$, we show how to construct in an efficient way a set of representatives of ideal classes for any Bass order in $B$. The algorithm does not require any knowledge of class numbers, and improves the equivalence checking process by using a simple calculation with global units. As an application, we compute ideal classes representatives for an order of level 30 in an algebra over the real quadratic field $\Q[\sqrt{5}]$.

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