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We study the global existence of solutions of a discrete (ODE based) model ona graph describing the formation of biological transportation networks,introduced by Hu and Cai. We propose an adaptation of this model so that amacroscopic (PDE based) system can be obtained as its formal continuum limit.We prove the global existence of weak solutions of the macroscopic PDE model.Finally, we present results of numerical simulations of the discrete model,illustrating the convergence to steady states, their non-uniqueness as well astheir dependence on initial data and model parameters.

ODE and PDE based modeling of biological transportation networks