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Search: MSC category 20H05 ( Unimodular groups, congruence subgroups [See also 11F06, 19B37, 22E40, 51F20] )

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1. CMB 2002 (vol 45 pp. 294)

Sebbar, Abdellah
Modular Subgroups, Forms, Curves and Surfaces
We study a class of subgroups of $\PSL_2 (\mathbb{Z})$ which can be characterized in different ways, such as congruence groups, modular forms, modular curves, elliptic surfaces, lattices and graphs.


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