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Information × Registration Number 0201U005898, 0197U003440 , R & D reports Title Elaboration of integral set theorj for nonlinear differential equations. popup.stage_title Head Perestyuk M.O., Registration Date 30-11-2001 Organization Taras Shevchenko Kiev university popup.description2 By means of the second Lyapunov method and of the freezing method, sufficient stability conditions for invariant tori of smooth and discontinuous systems were established. A birth phenomenon of multi-dimensional invariant tori under perturbation of Hamiltonian systems with abelian symmetries are described. A new numeric-analytical method for investigation of multi-point boundary-value problems, inclusive with those right-hand sides of which possess large Lipschitz constants, was elaborated.Sufficient conditions for the existence of periodic solutions for the systems of standard Bogolyubov's form were established. Product Description popup.authors popup.nrat_date 2020-04-02 Close