Unfolding of resonant saddles and the Dulac time

Pavao Mardesic, David Marín, Jordi Villadelprat

Research output: Contribution to journalArticleResearchpeer-review

13 Citations (Scopus)


In this work we study unfoldings of planar vector fields in a neighbourhood of a resonant saddle. We give a Ck normal form for the unfolding with respect to the conjugacy relation. Using our normal form we determine an asymptotic development, uniform with respect to the parameters, of the Dulac time of a resonant saddle deformation. Conjugacy relation instead of weaker equivalence relation is necessary when studying the time function. The Dulac time of a resonant saddle can be seen as the basic building block of the total period function of an unfolding of a hyperbolic polycycle.
Original languageEnglish
Pages (from-to)1221-1244
JournalDiscrete and Continuous Dynamical Systems
Issue number4
Publication statusPublished - 1 Aug 2008


  • Bifurcation of critical periods
  • Conjugacy
  • Dulac time
  • Normal form
  • Period function


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