We now look to the LC quantisation of the string. The first thing to note is that the commutation relation translates on the coefficients of the Fourier mode expansion...

It follows that we now want to turn our focus to quantising the string. Following Polchinski, we shall first take the approach of light-cone quantisation (LCQ)...

The aim at this juncture is to arrive classically at the Virasoro operators, or, what will be the Virasoro operators in the quantum theory...

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