Congruence testing for odd subgroups of the modular group
classification
🧮 math.NT
keywords
congruencesubgroupsubgroupscomputationallycriteriondeterminingearliereffective
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We give a computationally effective criterion for determining whether a finite-index subgroup of SL(2, Z) is a congruence subgroup, extending earlier work of Hsu for subgroups of PSL(2, Z).
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