Abstract
We follow, the evolution of ideas arising from Ramanujan's 1916 paper ‘On certain arithmetical functions’ by examining multiplicative η-products and quotients and their relation with the characters of the Mathieu groupM 24 and the automorphism group of the Leech lattice. This leads to the Monster and speculations on its geometric origin and current physics.
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Ford, D., McKay, J. Ramifications of Ramanujan's work on η-products. Proc. Indian Acad. Sci. (Math. Sci.) 99, 221–229 (1989). https://doi.org/10.1007/BF02864394
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DOI: https://doi.org/10.1007/BF02864394