基本説明
The only book specifically Borcherds-Kac-Moody algebras (apart from chapter 13 of Infinite dimensional Lie algebras, by Kac).
Full Description
A principal ingredient in the proof of the Moonshine Theorem, connecting the Monster group to modular forms, is the infinite dimensional Lie algebra of physical states of a chiral string on an orbifold of a 26 dimensional torus, called the Monster Lie algebra.
