Area-Preserving Normalizations for Centers of Planar Hamiltonian Systems

Authors: Mañosas, F.; Villadelprat, J.

Source: Journal of Differential Equations, Volume 179, Number 2, March 2002 , pp. 625-646(22)

Publisher: Academic Press

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Abstract:

It is well known that a nondegenerate center of an analytic Hamiltonian planar system can be brought to normal form by means of an analytic canonical change of coordinates. This normal form, that we denote by CNF, does not depend on the coordinate transformation. In this paper we give an elementary proof of these facts and we show some interesting applications of the machinery that we develop in order to prove them. For instance, we describe the space of coordinate transformations that bring a Hamiltonian nondegenerate center to its CNF, and we prove that they are all canonical when the center is non-isochronous. We also show that two Hamiltonian systems with a nondegenerate center are canonically conjugated if and only if both centers have the same period function.© 2002 Elsevier Science (USA).

Document Type: Research Article

Affiliations: Dept. De Matemàtiques, Facultat de Ciències, Universitat Autònoma de Barcelona, Bellaterra, Barcelona, 08193, Spain

Publication date: March 1, 2002

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