# Workshop on Dynamics of Vector Fields

- Dates:
- 21.05.92 - 22.05.92
- Place:
- Barcelona, Spain
- Organizers:
- Jaume Llibre

#### Participants:

Ll. Alsedà, J. C. Artés, J. Chavarriga, A. Cima, B. Coll, A. Delshams, A. Gasull, A. Guillamon, X. Jarque, R. Kooij, Chengzhi Li, J. Llibre, F. Mañosas, R. Prohens, J. W. Reyn, W. Slenk, J. Torregrosa, Yanqian Ye, Zhang Zhifen.

#### Lectures

J. C. Artés | "Separatrix connections in gradient quadratic vector fields" |

J. Chavarriga | "Integrable planar polynomial vector fields with a linear centre" |

B. Coll | "Limit cycles for a class of differential equations with discontinuous right-hand sides" |

A. Gasull | "Algebraic properties for the Liapunov constants" |

A. Guillamon | "Stability of limits cycles: a geometric approach" |

X. Jarque | "Structural stability of planar hamiltonian vector fields" |

R. Kooij | "On polynomial systems with algebraic invariant curves" |

R. Kooij | "On polynomial systems with centers and limit cycles" |

Chengzhi Li | "Limit cycles for bounded quadratic systems" |

J. Llibre | "On the dynamics of surface vector fields and surface homeomorphisms |

F. Mañosas | "Global injectivity via vector fields" |

R. Prohens | "Quadratic systems with two critical points and one of them degenerate" |

J. W. Reyn | "Classification in R of phase portraits of quadratic systems with a few finite singular points"^{12} |

J. Torregrosa | "Euler-Jacobi's formula for double points and applications to quadratic and cubic systems" |

Yanqian Ye | "Bifurcation problem of bounded quadratic systems" |

Zhang Zhifen | "Number of limit cycles of quadratic Hamiltonian vector fields after quadratic perturbations" |