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“Pariah Moonshine” Part II: For Whom the Moon Shines

This post is part of a series of posts by guest author Joshua Holden.

I ended Part I with the observation that the Monster group was connected with the symmetries of a group sitting in 196883-dimensional space, whereas the number 196884 appeared as part of a function used in number theory, the study of the properties of whole numbers.  In particular, a mathematician named John McKay noticed the number as one of the coefficients of a modular form.