On the some normal subgroups of the extended modular group
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摘要
In this paper, we give the group structures and the signatures of some normal subgroups of the extended modular group Π containing the principal congruence subgroup Γ(12).
论文关键词：Extended modular group,Principal congruence subgroup,Commutator subgroup
论文评审过程：Available online 19 April 2011.
论文官网地址：https://doi.org/10.1016/j.amc.2011.03.074
