A. Pronin
119899, Moscow, Vorobyevy gory
M.V.Lomonosov Moscow State University
Publications:
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Pronin A. V., Treschev D. V.
Continuous Averaging in Multi-frequency Slow-fast Systems
2000, vol. 5, no. 2, pp. 157-170
Abstract
It is well-known that in real-analytic multi-frequency slow-fast ODE systems the dependence of the right-hand sides on fast angular variables can be reduced to an exponentially small order by a near-identical change of the variables. Realistic constructive estimates for the corresponding exponentially small terms are obtained.
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Pronin A. V., Treschev D. V.
On the Inclusion of Analytic Maps into Analytic Flows
1997, vol. 2, no. 2, pp. 14-24
Abstract
We prove a general theorem on the representation of an analytic map isotopic to the identity as the Poincare map in a nonautonomous periodic in time analytic system of ODE. If the map belongs to some Lie group of diffeomorphisms, the vector field determining the ODE can be taken from the corresponding Lie algebra of vector fields. The proof uses a specific averaging procedure.
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