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Apr 29, 2011 at 17:59 comment added S. Carnahan Sorry, I meant that the vertex algebra was defined over the integers, but that the connection to string theory involves base change.
Apr 29, 2011 at 17:53 comment added Richard Borcherds There is no need to work over the complex numbers: the integral ring of symmetric functions gives an integral form of the vertex algebra. Though the harmonic oscillator modes do not generate this integral form.
Apr 29, 2011 at 17:19 history answered S. Carnahan CC BY-SA 3.0