On the discrete groups of Moonshine

Conway, John; McKay, John; Sebbar, Abdellah

doi:10.1090/S0002-9939-04-07421-0

On the discrete groups of Moonshine
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by John Conway, John McKay and Abdellah Sebbar PDF

Proc. Amer. Math. Soc. 132 (2004), 2233-2240 Request permission

Abstract:

We characterize the 171 discrete subgroups of $\mbox {PSL}_2(\mathbb {R})$ occurring in Monstrous Moonshine in terms of their group-theoretic properties alone.

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