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• W2950274107 abstract "The problem of describing the group of units $mathcal{U}(mathbb{Z} G)$ of the integral group ring $mathbb{Z} G$ of a finite group $G$ has attracted a lot of attention and providing presentations for such groups is a fundamental problem. Within the context of orders, a central problem is to describe a presentation of the unit group of an order $mathcal{O}$ in the simple epimorphic images $A$ of the rational group algebra $mathbb{Q} G$. Making use of the presentation part of Poincar'e's Polyhedron Theorem, Pita, del R'io and Ruiz proposed such a method for a large family of finite groups $G$ and consequently Jespers, Pita, del R'io, Ruiz and Zalesskii described the structure of $mathcal{U}(mathbb{Z} G)$ for a large family of finite groups $G$. In order to handle many more groups, one would like to extend Poincar'e's Method to discontinuous subgroups of the group of isometries of a direct product of hyperbolic spaces. If the algebra $A$ has degree 2 then via the Galois embeddings of the centre of the algebra $A$ one considers the group of reduced norm one elements of the order $O$ as such a group and thus one would obtain a solution to the mentioned problem. This would provide presentations of the unit group of orders in the simple components of degree 2 of $mathbb{Q} G$ and in particular describe the unit group of $mathbb{Z} G$ for every group $G$ with irreducible character degrees less than or equal to 2. The aim of this paper is to initiate this approach by executing this method on the Hilbert modular group, i.e. the projective linear group of degree two over the ring of integers in a real quadratic extension of the rationals. This group acts discontinuously on a direct product of two hyperbolic spaces of dimension two. The fundamental domain constructed is an analogue of the Ford domain of a Fuchsian or a Kleinian group." @default.
• W2950274107 created "2019-06-27" @default.
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• W2950274107 date "2015-04-29" @default.
• W2950274107 modified "2023-09-27" @default.
• W2950274107 title "Presentations of Groups Acting Discontinuously on Direct Products of Hyperbolic Spaces" @default.
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