Virasoro algebra
= Virasoro algebra
{c}
{title2=$[L_m,L_n]=(m-n)L_{m+n}+\frac{c}{12}m(m^2-1)\delta_{m+n,0}$}
{wiki}
The Virasoro algebra is the central extension of the algebra of holomorphic vector fields on a circle. Its generators are the Laurent modes of the holomorphic stress-energy tensor, and its central term is controlled by the <central charge> $c$.