Math to understand Monstrous Moonshine?

[CuriousLearner]

Hello, I am a curious individual who would like to understand the mathematics behind some papers I find interesting. Can anyone recommend to me good sources to introduce me to the mathematics behind monstrous moonshine?

 

[berkeman]

Hello, I am a curious individual who would like to understand the mathematics behind some papers I find interesting. Can anyone recommend to me good sources to introduce me to the mathematics behind monstrous moonshine?

Welcome to the PF.

Have you read the wikipedia article on the subject? https://en.wikipedia.org/wiki/Monstrous_moonshine

It looks to have a nice list of references that you could start your reading with...