KAM theory for the hamiltonian derivative wave equation
Massimiliano Berti, Luca Biasco, Michela Procesi (2013)
Annales scientifiques de l'École Normale Supérieure
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We prove an infinite dimensional KAM theorem which implies the existence of Cantor families of small-amplitude, reducible, elliptic, analytic, invariant tori of Hamiltonian derivative wave equations.