Abstract
As we recalled in the introduction, there are several ways to construct Fuchsian groups of the first kind. Of all of these groups, the most important from the number theoretic viewpoint are the arithmetic groups. The general definition of these groups is a bit technical so we content ourselves for the moment with describing a family of examples: the arithmetic groups coming from a quaternion algebra over Q. Before describing them, we begin by proving several general results concerning the space of lattices.
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Notes
- 1.
We denote by \(\mathrm{SO}_{0}(q)\mathop{\cong}\mathrm{SO}_{0}(2, 1)\) the connected component of the identity of the special orthogonal group of the quadratic form q on P.
- 2.
For a = b = 1 the map obtained in composing Ψ and Φ −1 induces an isomorphism between PSL(2, R) and SO0(2, 1). This is one of the isomorphisms – called exceptional – which exist only between certain “small” Lie groups (see [57, pp. 518–520]).
- 3.
Recall that the norm is F-invariant.
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Bergeron, N. (2016). Arithmetic Hyperbolic Surfaces. In: The Spectrum of Hyperbolic Surfaces. Universitext. Springer, Cham. https://doi.org/10.1007/978-3-319-27666-3_2
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