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math.DS2017
Hamiltonian perturbation theory for ultra-differentiable functions
Abed Bounemoura, Jacques Féjoz
Some scales of spaces of ultra-differentiable functions are introduced, having good stability properties with respect to infinitely many derivatives and compositions. They are well…
math.DS2017
KAM, -Gevrey regularity and the -Bruno-Rüssmann condition
Abed Bounemoura, Jacques Féjoz
We prove a new invariant torus theorem, for -Gevrey smooth Hamiltonian systems, under an arithmetic assumption which we call the -Bruno-Rüssmann condition, and which reduces…