I am currently reading Shimura's "Introduction to Arithmetic Theory of Automorphic Functions" and having a hard time trying to understand why Γ(N) has exactly [Γ(1):Γ(N)]/N equivalence classes of cusps.
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2$\begingroup$ Welcome to MSE. It is in your best interest that you type your posts (using MathJax) instead of posting links to pictures. $\endgroup$– José Carlos SantosCommented yesterday
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1$\begingroup$ Have you tried using other texts? $\endgroup$– AphelliCommented yesterday
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