A Diagrammatic Equation for Oriented Planar Graphs

In this paper we introduce a diagrammatic equation for the planar sector of square non hermitian random matrix models strongly remi-niscent of Polchinski’s equation in quantum field theory. Our funda-mental equation is first obtained by a graph counting argument and subsequently derived independently by a precise saddle point analysis of the corresponding random matrix integral. We solve the equation perturbatively for a generic model and conclude by exhibiting two duality properties of the perturbative solution.