### DGKV

I’ve been reading Dijkgraaf, Gukov, Kazakov and Vafa. They point out the obvious fact that the Vandermonde determinant (which arises from fixing the overall U(N) symmetry of the integral) that appears in the Matrix Integral can be represented using Fadeev-Popov “ghosts”.

So far, not too surprising. What had not occurred to me before they mentioned it, is that this leads to a *much simpler* set of Feynman rules for the perturbative evaluation of the Matrix Integral. It’s obvious, in retrospect, but leads to some very nice calculations.