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Cardinality or covolume of $S$-units in quaternion algebras
Let $D=\left(\frac{a,b}{\mathbb{Q}}\right)$ be a quaternion algebra over $\mathbb{Q}$.
Suppose $D$ is ramified at a finite set $S$ of places and $\infty\in S$.
It is known that the $S$-units (the unit ...
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