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Search: MSC category 34C25 ( Periodic solutions )

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1. CJM 1998 (vol 50 pp. 497)

Bolle, Philippe
 Morse index of approximating periodic solutions for the billiard problem. Application to existence results This paper deals with periodic solutions for the billiard problem in a bounded open set of $\hbox{\Bbbvii R}^N$ which are limits of regular solutions of Lagrangian systems with a potential well. We give a precise link between the Morse index of approximate solutions (regarded as critical points of Lagrangian functionals) and the properties of the bounce trajectory to which they converge. Categories:34C25, 58E50

2. CJM 1997 (vol 49 pp. 338)

Rousseau, C.; Toni, B.
 Local bifurcations of critical periods in the reduced Kukles system In this paper, we study the local bifurcations of critical periods in the neighborhood of a nondegenerate centre of the reduced Kukles system. We find at the same time the isochronous systems. We show that at most three local critical periods bifurcate from the Christopher-Lloyd centres of finite order, at most two from the linear isochrone and at most one critical period from the nonlinear isochrone. Moreover, in all cases, there exist perturbations which lead to the maximum number of critical periods. We determine the isochrones, using the method of Darboux: the linearizing transformation of an isochrone is derived from the expression of the first integral. Our approach is a combination of computational algebraic techniques (Gr\"obner bases, theory of the resultant, Sturm's algorithm), the theory of ideals of noetherian rings and the transversality theory of algebraic curves. Categories:34C25, 58F14
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