Virasoro algebra
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Sometimes called the Witt algebra with central extension,
![[L_m,L_n]=(m-n)L_{m+n}+\frac{c}{12}(m^3-m)\delta_{m,-n}\,](/w/images/math/d/6/1/d610bd143b28c10b920ef8f0404974f3.png)
.
Here 
is the central charge.
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