2 problems

Let $V$ be a holomorphic vertex operator algebra of central charge $24$, and let $V_1$ denote its dimension-one part. Schellekens classified $71$ possible choices for $V_1$, includ…

Let $V$ be a rational vertex operator algebra with central charge $c=24n$, where $n$ is an integer, and suppose that $V$ has only one irreducible module. Let the character of $V$ b…