= Virasoro character
{c}
{title2=$\chi(q)=\operatorname{Tr}q^{L_0-c/24}$}
A <Virasoro character> records the graded dimensions of a positive-energy <Virasoro algebra> module. A state of weight $h+N$ contributes $q^{h+N-c/24}$, and its multiplicity is the dimension of that energy eigenspace. The shift accounts for the <Casimir energy of a two-dimensional conformal field theory>. For a <Virasoro Verma module>, the character is $q^{h-c/24}\prod_{n\ge1}(1-q^n)^{-1}$, by counting the ordered descendant basis.
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