Normal subgroups of 𝑃𝑆𝐿₂(𝑍[√-3])

Normal subgroups of $PSL_2(Z[\sqrt {-3}])$
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Proc. Amer. Math. Soc. 124 (1996), 2935-2941

DOI: https://doi.org/10.1090/S0002-9939-96-03429-6

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We classify the normal subgroups of $PSL_2(Z[\sqrt {-3}])$ of index less than 960; they are all congruence subgroups.

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