Dipòsit Digital de Documents de la UAB 29 registres trobats  inicianterior17 - 26següent  anar al registre: La cerca s'ha fet en 0.01 segons. 
17.
18 p, 411.1 KB Piecewise linear perturbations of a linear center / Buzzi, Claudio (Universidade Estadual Paulista(Brazil). Departamento de Matemática) ; Torregrosa, Joan (Universitat Autònoma de Barcelona. Departament de Matemàtiques) ; Pessoa, Claudio (Universidade Estadual Paulista(Brazil). Departamento de Matemática)
This paper is mainly devoted to study the limit cycles that can bifurcate from a linear center using a piecewise linear perturbation in two zones. We consider the case when the two zones are separated by a straight line Σ and the singular point of the unperturbed system is in Σ. [...]
2013 - 10.3934/dcds.2013.33.3915
Discrete and continuous dynamical systems. Series A, Vol. 33 Núm. 9 (2013) , p. 3915-3936  
18.
12 p, 376.4 KB On the existence of bi-pyramidal central configurations of the n 2-body problem with an n-gon base / Corbera Subirana, Montserrat (Universitat de Vic. Departament de Tecnologies Digitals i de la Informació) ; Llibre, Jaume (Universitat Autònoma de Barcelona. Departament de Matemàtiques)
In this paper we prove the existence of central configurations of the n + 2-body problem where n equal masses are located at the vertices of a regular n-gon and the remaining 2 masses, which are not necessarily equal, are located on the straight line orthogonal to the plane containing the n-gon passing through its center. [...]
2013 - 10.3934/dcds.2013.33.1049
Discrete and continuous dynamical systems. Series A, Vol. 33 Núm. 3 (2013) , p. 1049-1060  
19.
21 p, 638.6 KB Canard Trajectories in 3D piecewise linear systems / Prohens, Rafel (Universitat de les Illes Balears. Departament de Ciències Matemàtiques i Informàtica) ; Teruel, Antonio E. (Universitat de les Illes Balears. Departament de Ciències Matemàtiques i Informàtica)
We present some results on singularly perturbed piecewise linear systems, similar to those obtained by the Geometric Singular Perturbation Theory. Unlike the differentiable case, in the piecewise linear case we obtain the global expression of the slow manifold Sε. [...]
2013 - 10.3934/dcds.2013.33.4595
Discrete and continuous dynamical systems. Series A, Vol. 33 Núm. 10 (2013) , p. 4595-4611  
20.
22 p, 760.6 KB Polynomial and rational first integrals for planar quasi-homogeneous polynomial differential sytems / Giné, Jaume (Universitat de Lleida. Departament de Matemàtica) ; Grau, Maite (Universitat de Lleida. Departament de Matemàtica) ; Llibre, Jaume (Universitat Autònoma de Barcelona. Departament de Matemàtiques)
In this paper we find necessary and sufficient conditions in order that a planar quasi-homogeneous polynomial differential system has a polynomial or a rational first integral. We also prove that any planar quasi-homogeneous polynomial differential system can be transformed into a differential system of the form u˙ = uf(v), ˙v = g(v) with f(v) and g(v) polynomials, and vice versa.
2013 - 10.3934/dcds.2013.33.4531
Discrete and continuous dynamical systems. Series A, Vol. 33 Núm. 10 (2013) , p. 4531-4547  
21.
18 p, 426.2 KB Rational Periodic Sequences for the Lyness Recurrence / Gasull, Armengol (Universitat Autònoma de Barcelona. Departament de Matemàtiques) ; Mañosa Fernández, Víctor 1971- (Universitat Politècnica de Catalunya. Departament de Matemàtica Aplicada III) ; Xarles Ribas, Francesc Xavier (Universitat Autònoma de Barcelona. Departament de Matemàtiques)
Consider the celebrated Lyness recurrence xn+2 = (a + xn+1)/xn with a ∈ Q. First we prove that there exist initial conditions and values of a for which it generates periodic sequences of rational numbers with prime periods 1, 2, 3, 5, 6, 7, 8, 9, 10 or 12 and that these are the only periods that rational sequences {xn}n can have. [...]
2012 - 10.3934/dcds.2012.32.587
Discrete and continuous dynamical systems. Series A, Vol. 32 Núm. 2 (2012) , p. 587-604  
22.
15 p, 420.0 KB Heteroclinic orbits for a class of Hamiltonian systems on Riemannian manifolds / Liu, Fei (Shanghai Jiaotong University. Department of Mathematics) ; Llibre, Jaume (Universitat Autònoma de Barcelona. Departament de Matemàtiques) ; Zhang, Xiang (Shanghai Jiaotong University. Department of Mathematics)
2011 - 10.3934/dcds.2011.29.1097
Discrete and continuous dynamical systems. Series A, Vol. 29 Núm. 3 (2011) , p. 1097-1111  
23.
10 p, 634.3 KB Hopf bifurcation for some analytic differential systems in R^3 via averaging theory / Llibre, Jaume (Universitat Autònoma de Barcelona. Departament de Matemàtiques) ; Valls, Clàudia 1973- (Universidade de Lisboa. Departamento de Matematica)
2011 - 10.3934/dcds.2011.30.779
Discrete and continuous dynamical systems. Series A, Vol. 30 Núm. 3 (2011) , p. 779-790  
24.
15 p, 341.9 KB On the birth of minimal sets for perturbed reversible vector fields / Llibre, Jaume (Universitat Autònoma de Barcelona. Departament de Matemàtiques) ; Martins, Ricardo Miranda (Universidade Estadual de Campina (Brasil). Departamento de Matematica) ; Teixeira, Marco Antonio (Universidade Estadual de Campina (Brasil). Departamento de Matematica)
The results in this paper fit into a program to study the existence of periodic orbits, invariant cylinders and tori filled with periodic orbits in perturbed reversible systems. Here we focus on bifurcations of one-parameter families of periodic orbits for reversible vector fields in R4. [...]
2011 - 10.3934/dcds.2011.31.763
Discrete and continuous dynamical systems. Series A, Vol. 31 Núm. 3 (2011) , p. 763-777  
25.
14 p, 492.6 KB On the limit cycles bifurcating from an ellipse of a quadratic center / Llibre, Jaume (Universitat Autònoma de Barcelona. Departament de Matemàtiques) ; Schlomiuk, Dana (Université de Montréal(Canada). Département de Mathématiques et Statistique)
Consider the class of all quadratic centers whose period annulus has a periodic solution whose phase curve is an ellipse E. The period annulus of any of such quadratic centers has cyclicity at least one, and this one is due to a family of algebraic limit cycles(formed by ellipses) bifurcating from the ellipse E. [...]
2015 - 10.3934/dcds.2015.35.1091
Discrete and continuous dynamical systems. Series A, Vol. 35 Núm. 3 (2015) , p. 1091-1102  
26.
33 p, 1.1 MB Bifurcation values for a familiy of planar vector fields of degree five / García-Saldaña, Johanna Denise (Universitat Autònoma de Barcelona. Departament de Matemàtiques) ; Gasull, Armengol (Universitat Autònoma de Barcelona. Departament de Matemàtiques) ; Giacomini, Hector (Université de Tours (France). Laboratoire de Mathématiques et Physique Théorique)
We study the number of limit cycles and the bifurcation diagram in the Poincar' sphere of a one-parameter family of planar differential equations of degree e ˙ five x = Xb (x) which has been already considered in previous papers. [...]
2015 - 10.3934/dcds.2015.35.669
Discrete and continuous dynamical systems. Series A, Vol. 35 Núm. 2 (2015) , p. 669-701  

Dipòsit Digital de Documents de la UAB : 29 registres trobats   inicianterior17 - 26següent  anar al registre:
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