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2000, Volume 6, Issue 3: 609-624. Doi: 10.3934/dcds.2000.6.609
This issue Previous Article Dynamic theory for incompressible Smectic-A liquid crystals: Existence and regularity Next Article Asymptotic smoothing effect for weakly damped forced Korteweg-de Vries equations

Center-focus and isochronous center problems for discontinuous differential equations

  • 1.

    Dept. de Matemàtiques i Informàtica, Universitat de les Illes Balears, Facultat de ciències, 07071, Palma de Mallorca

  • 2.

    Dept. de Matemàtiques, Universitat Autónoma de Barcelona, Edifici C, 08193 Bel-laterra, Barcelona

Received:  October 1999
Revised:  April 2000
Published:  July 2000
Abstract Related Papers Cited by
    Abstract
  • The study of the center focus problem and the isochronicity problem for differential equations with a line of discontinuities is usually done by computing the whole return map as the composition of the two maps associated to the two smooth differential equations. This leads to large formulas which usually are treated with algebraic manipulators. In this paper we approach to this problem from a more theoretical point of view. The results that we obtain relate the order of degeneracy of the critical point of the discontinuous differential equations with the order of degeneracy of the two smooth component differential equations. Finally we apply them to some families of examples.
    Mathematics Subject Classification: 34C25, 58F21, 58F22.

    Citation:
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