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I want to know the mathematician who named PSL(2,Z) as the modular group first. Also I would be pleased if someone suggest me some papers about the history of the modular group. Thanks a lot in advance for your help.

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  • $\begingroup$ I wouldn't be surprized that this notation comes from Bourbaki (say in the fifties' of the past century) $\endgroup$ Jul 5 '21 at 22:40

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