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Zbl 0916.11024
Lascurain Orive, Antonio
The shape of the Ford domains for $\Gamma_0(N)$.
(English)
[J] Conform. Geom. Dyn. 3, No. 1, 1-23, electronic only (1999). ISSN 1088-4173/e

The author describes a very explicit technique to calculate the number of sides of the Ford domains for the congruence subgroup $$\Gamma_0(N)= \left\{\pmatrix a& b \\ c& d \endpmatrix\in \text{SL}(2,\Bbb Z) \mid c\equiv 0\bmod N\right\}$$ of the modular group $\text{SL}(2,\Bbb Z)$.
[Gerhard Rosenberger (Dortmund)]
MSC 2000:
*11F06 Structure of modular groups and generalizations
20H10 Fuchsian groups and their generalizations (group theory)

Keywords: Ford domains; congruence subgroup; modular group

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