The group structure of the normalizer of Gamma₀(N)
classification
🧮 math.NT
keywords
gammagroupnormalizerstructureatkin-lehnercorrectdeterminehecke
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We determine the group structure of the normalizer of $\Gamma_0(N)$ in $SL_2(\R)$ modulo $\Gamma_0(N)$. These results correct the Atkin-Lehner statement at the paper Hecke operators of $\Gamma_0(N)$.
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