# Topological expansion and boundary conditions

@article{Eynard2007TopologicalEA, title={Topological expansion and boundary conditions}, author={Bertrand Eynard and Nicolas Orantin}, journal={Journal of High Energy Physics}, year={2007}, volume={2008}, pages={037-037} }

In this article, we compute the topological expansion of all possible mixed-traces in a hermitian two matrix model. In other words give a recipe to compute the number of discrete surfaces of given genus, carrying an Ising model, and with all possible given boundary conditions. The method is recursive, and amounts to recursively cutting surfaces along interfaces. The result is best represented in a diagrammatic way, and is thus rather simple to use.

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