The Applied Mathematics department at ENSTA Paris has two missions: one is a research mission and the other one a teaching mission (conception and teaching). The research activities of the lab are based on a common tool: the Mathematics and are related to few Applied Mathematics topics such as Partial Differential Equations, Dynamic systems, Optimal control, Continuous and discrete optimisation, Stochastic analysis, Numerical methods and various application domains adressed : Electromagnetism, Elastodynamics, Aeroacoustics, Astrophysics, Quantitative finance, Large scale optimisation ... These activities are grouped in three teams: