Geodesic
$(2+)$-Replication and the Baby Monster
Symmetry, integrability and geometry: methods and applications, Tome 14 (2018) Cet article a éte moissonné depuis la source Math-Net.Ru

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The definitions of replicable and completely replicable functions are intimately related to the Hecke operators for the modular group. We define the notions of "$(2+)$-replicable" and "completely $(2+)$-replicable" functions by considering the Hecke operators for $\Gamma_0(2)^+$. We prove that the McKay–Thompson series for $2\cdot\mathbb{B}$, as computed by Höhn, are completely $(2+)$-replicable.
Keywords: moonshine; baby monster; replication. 
@article{SIGMA_2018_14_a59,
     author = {Chris Cummins and Rodrigo Matias},
     title = {$(2+)${-Replication} and the {Baby} {Monster}},
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     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SIGMA_2018_14_a59/}
}
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Chris Cummins; Rodrigo Matias. $(2+)$-Replication and the Baby Monster. Symmetry, integrability and geometry: methods and applications, Tome 14 (2018). http://geodesic.mathdoc.fr/item/SIGMA_2018_14_a59/

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