25 citations
- Universitat Autònoma de BarcelonaES4 papers
- Brazilian Society of Computational and Applied MathematicsBR1 paper
- Centre de Recerca MatemàticaES1 paper
- Hospital de Clínicas da UnicampBR1 paper
- Universidade de BrasíliaBR1 paper
- Universidade de São PauloBR1 paper
- Universidade Estadual de Campinas (UNICAMP)BR1 paper
- Universidade Estadual de LondrinaBR1 paper
- Universidade Estadual Paulista (Unesp)BR1 paper
- Universidade Federal da Integração Latino-AmericanaBR1 paper
- Universidade Federal de ItajubáBR1 paper
- Universidade Federal de RondôniaBR1 paper
10 papers
Non-thermal emission from the vicinity of the magnetar CXOU J171405.7-381031
Manoel F. Sousa, Rita. C. Anjos
Magnetars are neutron stars with ultra-strong magnetic fields (- G) and are promising candidates for high-energy particle acceleration. We present a multiw…
Limit cycles and invariant algebraic curves
Armengol Gasull, Paulo Santana
We give lower bounds in terms of~ for the number of limit cycles of polynomial vector fields of degree~ having any prescribed invariant algebraic curve. By applying them wh…
The hybrid matching of Hurwitz systems
Luis Fernando Mello, Paulo Santana
In this paper we study planar hybrid systems composed by two stable linear systems, defined by Hurwitz matrices, in addition with a jump that can be a piecewise linear, a polynomia…
On the limit cycles of a quartic model for evolutionary stable strategies
Armengol Gasull, Luiz F. S. Gouveia, Paulo Santana
This paper studies the number of centers and limit cycles of the family of planar quartic polynomial vector fields that has the invariant algebraic curve The…
Limit cycles and chaos in planar hybrid systems
Jaume Llibre, Paulo Santana
In this paper we study the family of planar hybrid differential systems formed by two linear centers and a polynomial reset map of any degree. We study their limit cycles and also…
On a variant of Hilbert's 16th problem
Armengol Gasull, Paulo Santana
We study the number of limit cycles that a planar polynomial vector field can have as a function of its number of monomials. We prove that the number of limit cycles increases…