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This project aims at studying the renormalization of non-commutative field theories in a systematic way. Recently H. Grosse and R. Wulkenhaar proved that one can cure the IR/UV mixing of such theories by adding a new term in the Lagrangian. For the non-com mutative phi**4 theory, this harmonic potential term makes the theory renormalizable to all orders.An other model is renormalizable thanks to a ...