On the measure of Lagrangian invariant tori in nearly--integrable mechanical systems (draft)

L. Biasco, L. Chierchia

Consider a real--analytic nearly--integrable mechanical system with potential $f$, namely, a Hamiltonian system, having a real-analytic Hamiltonian $$ H(y,x)=\frac12 | y |^2 +\e f(…