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The emergence of a critical dimension is one of the most striking features ofstring theory. One way to obtain it is by demanding closure of the Lorentzalgebra in the light-cone gauge quantisation, as discovered for bosonic stringsmore than fourty years ago. We give a detailed derivation of this classicalresult based on the operator product expansion on the Lorentzian world-sheet.

The Lorentz Anomaly via Operator Product Expansion