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  "body": "\n## Summary\n\n**Arithmetic Fuchsian groups** are a special class of Fuchsian groups constructed using orders in quaternion algebras. They are particular instances of arithmetic groups. The prototypical example of an arithmetic Fuchsian group is the modular group $\\mathrm{PSL}_2(\\mathbb{Z} )$. They, and the hyperbolic surface associated to their action on the hyperbolic plane, often exhibit particularly regular behaviour among Fuchsian groups and hyperbolic surfaces.\n",
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