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Results overview:
Found
34
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Articles
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33
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33
records found 1 - 10
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1.
11 p, 281.1 KB
Cyclicity Near Infinity in Piecewise Linear Vector Fields Having a Nonregular Switching Line
/
Bastos, Jefferson L. R.
(Universidade Estadual Paulista. Departamento de Matemática) ;
Buzzi, Claudio
(Universidade Estadual Paulista. Departamento de Matemática) ;
Torregrosa, Joan
(Universitat Autònoma de Barcelona. Departament de Matemàtiques)
In this paper we recover the best lower bound for the number of limit cycles in the planar piecewise linear class when one vector field is defined in the first quadrant and a second one in the others. [...]
2023 -
10.1007/s12346-023-00817-9
Qualitative theory of dynamical systems
,
Vol. 22, Issue 4 (December 2023)
, art. 125
Detailed record
-
2.
17 p, 334.7 KB
The local cyclicity problem : Melnikov method using Lyapunov constants
/
Gouveia, Luiz Fernando
(Universitat Autònoma de Barcelona. Departament de Matemàtiques) ;
Torregrosa, Joan
(Universitat Autònoma de Barcelona. Departament de Matemàtiques)
In 1991, Chicone and Jacobs showed the equivalence between the computation of the first-order Taylor developments of the Lyapunov constants and the developments of the first Melnikov function near a non-degenerate monodromic equilibrium point, in the study of limit cycles of small-amplitude bifurcating from a quadratic centre. [...]
2022 -
10.1017/S0013091522000128
Proceedings of the Edinburgh Mathematical Society
,
Vol. 65 Issue 2 (May 2022)
, p. 356-375
Detailed record
-
3.
31 p, 607.7 KB
On the cyclicity of Kolmogorov polycycles
/
Marín Pérez, David
(Universitat Autònoma de Barcelona. Departament de Matemàtiques) ;
Villadelprat Yagüe, Jordi
(Universitat Autònoma de Barcelona. Departament de Matemàtiques) ;
Centre de Recerca Matemàtica
In this paper we study planar polynomial Kolmogorov's differential systems Xμ{x˙=f(x,y;μ),y˙=g(x,y;μ), with the parameter μ varying in an open subset Λ⊂RN. Compactifying Xμ to the Poincaré disc, the boundary of the first quadrant is an invariant triangle Γ, that we assume to be a hyperbolic polycycle with exactly three saddle points at its vertices for all μ∈Λ. [...]
2022 -
10.14232/ejqtde.2022.1.35
Electronic Journal of Qualitative Theory of Differential Equations
,
Vol. 35 (2022)
, p. 1-31
Detailed record
-
4.
17 p, 468.6 KB
Bifurcation of limit cycles in piecewise quadratic differential systems with an invariant straight line
/
Da Cruz, Leonardo Pereira Costa
(Departamento de Matemática. Universidade Federal de São Carlos) ;
Torregrosa, Joan
(Universitat Autònoma de Barcelona. Departament de Matemàtiques)
We solve the center-focus problem in a class of piecewise quadratic polynomial differential systems with an invariant straight line. The separation curve is also a straight line which is not invariant. [...]
2022 -
10.1016/j.jmaa.2022.126256
Journal of mathematical analysis and applications
,
Vol. 514, Issue 1 (October 2022)
, art. 126256
Detailed record
-
5.
28 p, 1.4 MB
Orbitally symmetric systems with applications to planar centers
/
Bastos, Jefferson L. R.
(Universidade Estadual Paulista Júlio de Mesquita Filho. Departamento de Matemática) ;
Buzzi, Claudio
(Universidade Estadual Paulista Júlio de Mesquita Filho. Departamento de Matemática) ;
Torregrosa, Joan
(Universitat Autònoma de Barcelona. Departament de Matemàtiques)
We present a generalization of the most usual symmetries in differential equations known as the time-reversibility and the equivariance ones. We check that the typical properties are also valid for the new definition that unifies both. [...]
2021 -
10.3934/cpaa.2021107
Communications on pure & applied analysis
,
Vol. 20, Issue 10 (October 2021)
, p. 3319-3346
Detailed record
-
6.
24 p, 407.3 KB
Centers and limit cycles of vector fields defined on invariant spheres
/
Buzzi, Claudio
(Universidade Estadual Paulista. Instituto de Biociências Letras e Ciências Exatas) ;
Rodero, Ana Livia
(Universidade Estadual Paulista. Instituto de Biociências Letras e Ciências Exatas) ;
Torregrosa, Joan
(Universitat Autònoma de Barcelona. Departament de Matemàtiques)
The aim of this paper is the study of the center-focus and cyclicity problems inside the class X of 3-dimensional vector fields that admit a first integral that leaves invariant any sphere centered at the origin. [...]
2021 -
10.1007/s00332-021-09751-z
Journal of Nonlinear Science
,
Vol. 31, Issue 6 (December 2021)
, art. 92
Detailed record
-
7.
6 p, 207.2 KB
Constructions in Minimalism : A Functional Perspective on Cyclicity
/
Trotzke, Andreas
(Universitat Autònoma de Barcelona. Centre de Lingüística Teòrica)
This article presents a perspective on syntactic cyclicity in minimalism that is compatible with fundamental ideas in construction-grammar approaches. In particular, I outline the minimalist approach to syntactic structure building and highlight that units of potentially any phrasal size can be atomic items in the syntactic derivation, showing that the opposition between simplex linguistic items ("words") and more complex ones ("phrases") in minimalism is in principle as artificial as in many construction-grammar approaches. [...]
2020 -
10.3389/fpsyg.2020.02152
Frontiers in psychology
,
Vol. 11 (september 2020)
Detailed record
-
8.
21 p, 476.1 KB
Lower bounds for the local cyclicity for families of centers
/
Giné, Jaume
(Universitat de Lleida. Departament de Matemàtica) ;
Gouveia, Luiz Fernando
(Universitat Autònoma de Barcelona. Departament de Matemàtiques) ;
Torregrosa, Joan
(Universitat Autònoma de Barcelona. Departament de Matemàtiques)
In this paper we are interested on how the local cyclicity of a family of centers depends on the parameters. This fact, was pointed out in [21], to prove that there exists a family of cubic centers, labeled by CD12 31 in [25], with more local cyclicity than expected. [...]
2021 -
10.1016/j.jde.2020.11.035
Journal of differential equations
,
Vol. 275 (February 2021)
, p. 309-331
Detailed record
-
9.
21 p, 356.4 KB
Local cyclicity in low degree planar piecewise polynomial vector fields
/
Gouveia, Luiz Fernando
(Universitat Autònoma de Barcelona. Departament de Matemàtiques) ;
Torregrosa, Joan
(Universitat Autònoma de Barcelona. Departament de Matemàtiques)
In this work, we are interested in isolated crossing periodic orbits in planar piecewise polynomial vector fields defined in two zones separated by a straight line. In particular, in the number of limit cycles of small amplitude. [...]
2021 -
10.1016/j.nonrwa.2020.103278
Nonlinear Analysis: Real World Applications
,
Vol. 60 (August 2021)
, art. 103278
Detailed record
-
10.
30 p, 468.7 KB
Lower bounds for the local cyclicity of centers using high order developments and parallelization
/
Gouveia, Luiz Fernando
(Universitat Autònoma de Barcelona. Departament de Matemàtiques) ;
Torregrosa, Joan
(Universitat Autònoma de Barcelona. Departament de Matemàtiques)
We are interested in small-amplitude isolated periodic orbits, so-called limit cycles, surrounding only one equilibrium point, that we locate at the origin. We develop a parallelization technique to study higher order developments, with respect to the parameters, of the return map near the origin. [...]
2021 -
10.1016/j.jde.2020.08.027
Journal of differential equations
,
Vol. 271 (January 2021)
, p. 447-479
Detailed record
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Articles :
33
records found 1 - 10
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Books and collections
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1.
16 p, 331.6 KB
Canard cycles with three breaking mechanisms
/
Caubergh, Magdalena
(Universitat Autònoma de Barcelona. Departament de Matemàtiques) ;
Roussarie, Robert
(Université de Bourgogne)
This article deals with relaxation oscillations from a generic balanced canard cycle Γ subject to three breaking parameters of Hopf or jump type. We prove that in a rescaled layer of Γ there bifurcate at most five relaxation oscillations.
Cham, Switzerland: Springer, 2016 (
Springer Proceedings in Mathematics & Statistics ; 157
) -
10.1007/978-3-319-31323-8_4
Mathematical Sciences with Multidisciplinary Applications
,
2016,
p. 61-77
Detailed record
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