We consider the large N limit of three-dimensional U(N)(k) Chern-Simons theory coupled to a Dirac fermion in the fundamental representation. In this limit, we compute several correlators to all orders in the 't Hooft coupling lambda equivalent to N/k. It was suggested recently that this theory is dual to the Legendre-transformed theory of scalar fields coupled to Chern-Simons gauge interactions. Our results show that this duality holds for any value of the 't Hooft coupling, at least at the level of the planar 3-point functions. In addition, we determine the sign in the duality transformation of the Chern-Simons level, as well as the relation between the triple-trace deformation which exists in the bosonic Chern-Simons theory and in the Legendre-transformed fermionic theory.
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