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1. CMB 2002 (vol 45 pp. 294)
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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.
Category:20H05 |