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Is there a sequel to TFA? It has nothing about the promised "Monster".

It feels like the preamble to a longer article that never materialises.

He also gets the terminology wrong. "Pre-image" and "image" refer to sets, not individual objects.

There was more info on the monster group and monstrous moonshine in this linked article: https://www.quantamagazine.org/mathematicians-chase-moonshin...