The sporadic group Co3, Hauptmodul and Belyi map
arXiv:1802.06923
Abstract
We calculate the hauptmodul and Belyi map of a genus zero subgroup of the modular group defined via a canonical homomorphism by the Conway group group Co3. Our main result is the Belyi map and its field of definition.
The data for the Belyi map is contained in 21 additional data files accompanying the manuscript and one SAGE file with a small demonstration how to use the data files