Asymmetric oscillators and twist mappings. Zbl 0860.34017
Ortega, Rafael |
|
1996
|
Boundedness in a piecewise linear oscillator and a variant of the small twist theorem. Zbl 1030.34035
Ortega, Rafael |
|
1999
|
Roots of unity and unbounded motions of an asymmetric oscillator. Zbl 0899.34023
Alonso, José Miguel; Ortega, Rafael |
|
1998
|
The periodic predator-prey Lotka-Volterra model. Zbl 0849.34026
López-Gómez, Julián; Ortega, Rafael; Tineo, Antonio |
|
1996
|
Periodic solutions of a Newtonian equation: Stability by the third approximation. Zbl 0855.34058
Ortega, Rafael |
|
1996
|
Unbounded solutions of semilinear equations at resonance. Zbl 0896.34026
Alonso, José Miguel; Ortega, Rafael |
|
1996
|
Almost periodic linear differential equations with non-separated solutions. Zbl 1108.34008
Ortega, Rafael; Tarallo, Massimo |
|
2006
|
The stability of the equilibrium of a nonlinear Hill’s equation. Zbl 0807.34065
Ortega, Rafael |
|
1994
|
Stability and index of periodic solutions of an equation of Duffing type. Zbl 0686.34052
Ortega, Rafael |
|
1989
|
A maximum principle for periodic solutions of the telegraph equation. Zbl 0932.35016
Ortega, Rafael; Robles-Pérez, Aureliano M. |
|
1998
|
The index of Lyapunov stable fixed points in two dimensions. Zbl 0811.34018
Dancer, E. N.; Ortega, R. |
|
1994
|
Some applications of the topological degree to stability theory. Zbl 0834.34058
Ortega, Rafael |
|
1995
|
A periodic prey-predator system. Zbl 0808.34043
Amine, Zitan; Ortega, Rafael |
|
1994
|
Invariant curves of mappings with averaged small twist. Zbl 1136.37336
Ortega, Rafael |
|
2001
|
Topological degree and stability of periodic solutions for certain differential equations. Zbl 0677.34042
Ortega, Rafael |
|
1990
|
On the families of periodic orbits of the Sitnikov problem. Zbl 1159.70010
Llibre, Jaume; Ortega, Rafael |
|
2008
|
A maximum principle for bounded solutions of the telegraph equations and applications to nonlinear forcings. Zbl 0972.35016
Mawhin, Jean; Ortega, Rafael; Robles-Pérez, Aureliano M. |
|
2000
|
Optimal bounds for bifurcation values of a superlinear periodic problem. Zbl 1088.34036
Ortega, Rafael; Zhang, Meirong |
|
2005
|
The twist coefficient of periodic solutions of a time-dependent Newton’s equation. Zbl 0761.34036
Ortega, Rafael |
|
1992
|
Maximum principles for bounded solutions of the telegraph equation in space dimensions two and three and applications. Zbl 1082.35040
Mawhin, Jean; Ortega, Rafael; Robles-Pérez, Aureliano M. |
|
2005
|
Parabolic fixed points and stability criteria for nonlinear Hill’s equation. Zbl 0973.34046
Núñez, Daniel; Ortega, Rafael |
|
2000
|
A counterexample for the damped pendulum equation. Zbl 0679.70022
Ortega, R. |
|
1987
|
Periodic differential equations in the plane. A topological perspective. Zbl 1427.34052
Ortega, Rafael |
|
2019
|
Abstract competitive systems and orbital stability in \(\mathbb R^3\). Zbl 0951.34032
Ortega, Rafael; Sánchez, Luis Ángel |
|
2000
|
Existence of asymptotically stable periodic solutions of a forced equation of Liénard type. Zbl 0802.34050
Zitan, Amine; Ortega, Rafael |
|
1994
|
Dynamics of a forced oscillator having an obstacle. Zbl 1054.34057
Ortega, R. |
|
2002
|
Linear motions in a periodically forced Kepler problem. Zbl 1235.34136
Ortega, Rafael |
|
2011
|
Bounded solutions of second order semilinear evolution equations and applications to the telegraph equation. Zbl 0927.34048
Alonso, Jose Miguel; Mawhin, Jean; Ortega, Rafael |
|
1999
|
Homeomorphisms of the disk with trivial dynamics and extinction of competitive systems. Zbl 0886.34025
Campos, Juan; Ortega, Rafael; Tineo, Antonio |
|
1997
|
Almost periodic upper and lower solutions. Zbl 1043.34046
Ortega, Rafael; Tarallo, Massimo |
|
2003
|
Boundedness and global asymptotic stability of a forced oscillator. Zbl 0826.34043
Alonso, Jose Miguel; Ortega, Rafael |
|
1995
|
The first interval of stability of a periodic equation of Duffing type. Zbl 0757.34035
Ortega, Rafael |
|
1992
|
Non-continuation of the periodic oscillations of a forced pendulum in the presence of friction. Zbl 0970.34037
Ortega, Rafael; Serra, Enrico; Tarallo, Massimo |
|
2000
|
A variational method for the existence of bounded solutions of a sublinear forced oscillator. Zbl 1072.34038
Ortega, Rafael; Verzini, Gianmaria |
|
2004
|
Global bifurcations from the center of mass in the Sitnikov problem. Zbl 1380.70028
Ortega, Rafael; Rivera, Andrés |
|
2010
|
The number of stable periodic solutions of time-dependent Hamiltonian systems with one degree of freedom. Zbl 0946.34036
Ortega, Rafael |
|
1998
|
Periodic perturbations of an isochronous center. Zbl 1043.34049
Ortega, Rafael |
|
2002
|
Complete orbits for twist maps on the plane: extensions and applications. Zbl 1228.37035
Kunze, Markus; Ortega, Rafael |
|
2011
|
Complete orbits for twist maps on the plane: the case of small twist. Zbl 1276.37035
Kunze, Markus; Ortega, Rafael |
|
2011
|
A criterion for asymptotic stability based on topological degree. Zbl 0846.34056
Ortega, Rafael |
|
1996
|
Differential equations with limit-periodic forcings. Zbl 1021.34015
Alonso, Ana I.; Obaya, Rafael; Ortega, Rafael |
|
2003
|
Degree theory and almost periodic problems. Zbl 1204.34054
Ortega, Rafael |
|
2008
|
Regularized variational principles for the perturbed Kepler problem. Zbl 1482.70016
Barutello, Vivina; Ortega, Rafael; Verzini, Gianmaria |
|
2021
|
Periodic solutions and regularization of a Kepler problem with time-dependent perturbation. Zbl 1422.37041
Boscaggin, Alberto; Ortega, Rafael; Zhao, Lei |
|
2019
|
Monotone twist maps and periodic solutions of systems of Duffing type. Zbl 1331.34070
Boscaggin, Alberto; Ortega, Rafael |
|
2014
|
On the spectrum of some linear noncooperative elliptic systems with radial symmetry. Zbl 0841.35031
Dancer, E. N.; López-Gómez, J.; Ortega, R. |
|
1995
|
Generic results for the existence of nondegenerate periodic solutions of some differential systems with periodic nonlinearities. Zbl 0742.34043
Martinez-Amores, P.; Mawhin, J.; Ortega, R.; Willem, M. |
|
1991
|
Symmetric periodic solutions in the Sitnikov problem. Zbl 1354.34072
Ortega, Rafael |
|
2016
|
Massera’s theorem for quasi-periodic differential equations. Zbl 1005.37021
Ortega, Rafael; Tarallo, Massimo |
|
2002
|
Superlinear elliptic boundary value problems. Zbl 0668.35032
Kannan, Rangachary; Ortega, Rafael |
|
1987
|
Stability of a periodic problem of Ambrosetti-Prodi type. Zbl 0724.34059
Ortega, Rafael |
|
1990
|
Global asymptotic stability of a forced Newtonian system with dissipation. Zbl 0844.34047
Alonso, José Miguel; Ortega, Rafael |
|
1995
|
Twist mappings with non-periodic angles. Zbl 1326.37032
Kunze, Markus; Ortega, Rafael |
|
2013
|
An exclusion principle for periodic competitive systems in three dimensions. Zbl 0901.34049
Ortega, Rafael; Tineo, Antonio |
|
1998
|
Nonexistence of periodic solutions of a complex Riccati equation. Zbl 0842.34046
Campos, Juan; Ortega, Rafael |
|
1996
|
Periodic solutions of pendulum-type equations. Zbl 0608.34047
Kannan, Rangachary; Ortega, Rafael |
|
1985
|
Landesman-Lazer conditions for problems with “one-side unbounded” nonlinearities. Zbl 0624.35033
Kannan, Rangachary; Ortega, Rafael |
|
1985
|
Existence of solutions of \(x''+x+g(x)=p(t)\), \(x(0)=0=x(\pi)\). Zbl 0585.34001
Kannan, Rangachary; Ortega, Rafael |
|
1986
|
Attractors with vanishing rotation number. Zbl 1253.37048
Ortega, Rafael; Ruiz del Portal, Francisco R. |
|
2011
|
On the number of positive periodic solutions for planar competing Lotka-Volterra systems. Zbl 0903.34037
Ortega, Rafael; Tineo, Antonio |
|
1995
|
Resonance and non-resonance in a problem of boundedness. Zbl 0858.34018
Ortega, Rafael; Tineo, Antonio |
|
1996
|
Escaping orbits are rare in the quasi-periodic Fermi-Ulam ping-pong. Zbl 1437.37028
Kunze, Markus; Ortega, Rafael |
|
2020
|
Almost periodic equations and conditions of Ambrosetti-Prodi type. Zbl 1055.34085
Ortega, Rafael; Tarallo, Massimo |
|
2003
|
Complete orbits for twist maps on the plane. Zbl 1149.37024
Kunze, Markus; Ortega, Rafael |
|
2008
|
Periodic solutions of a perturbed Kepler problem in the plane: from existence to stability. Zbl 1343.37045
Boscaggin, Alberto; Ortega, Rafael |
|
2016
|
A duality theorem for periodic solutions of a class of second order evolution equations. Zbl 1010.34054
Ortega, Rafael; Robles-Pérez, Aureliano M. |
|
2001
|
Twist mappings, invariant curves and periodic differential equations. Zbl 1172.34326
Ortega, Rafael |
|
2001
|
Maximum principles around an eigenvalue with constant eigenfunctions. Zbl 1170.35029
Campos, J.; Mawhin, J.; Ortega, R. |
|
2008
|
Prevalence of non-degenerate periodic solutions in the forced pendulum equation. Zbl 1278.34042
Ortega, Rafael |
|
2013
|
Subharmonic solutions of the forced pendulum equation: a symplectic approach. Zbl 1303.34028
Boscaggin, A.; Ortega, R.; Zanolin, F. |
|
2014
|
A forced pendulum equation with many periodic solutions. Zbl 0899.34031
Ortega, Rafael |
|
1997
|
A boundedness result of Landesman-Lazer type. Zbl 0817.34017
Ortega, Rafael |
|
1995
|
Existence theorems for equations in normed spaces and boundary value problems for nonlinear vector ordinary differential equations. Zbl 0558.47046
Cañada, A.; Ortega, R. |
|
1984
|
Asymptotic stability of forced oscillations emanating from a limit cycle. Zbl 1213.34060
Makarenkov, Oleg; Ortega, Rafael |
|
2011
|
Generalized periodic orbits in some restricted three-body problems. Zbl 1498.70015
Ortega, Rafael; Zhao, Lei |
|
2021
|
Some analytical results about periodic orbits in the restricted three body problem with dissipation. Zbl 1266.70014
Margheri, Alessandro; Ortega, Rafael; Rebelo, Carlota |
|
2012
|
Dynamics of Kepler problem with linear drag. Zbl 1298.70010
Margheri, Alessandro; Ortega, Rafael; Rebelo, Carlota |
|
2014
|
The pendulum equation: from periodic to almost periodic forcings. Zbl 1240.34222
Ortega, Rafael |
|
2009
|
Persistence of equilibria as periodic solutions of forced systems. Zbl 1237.34077
Buică, Adriana; Ortega, Rafael |
|
2012
|
Long-time stability estimates for the non-periodic Littlewood boundedness problem. Zbl 1272.34043
Kunze, Markus; Ortega, Rafael |
|
2013
|
Stable periodic solutions in the forced pendulum equation. Zbl 1303.34031
Ortega, Rafael |
|
2013
|
Degenerate equations of pendulum-type. Zbl 0958.34033
Ortega, Rafael; Tarallo, Massimo |
|
2000
|
On Littlewood’s problem for the asymmetric oscillator. Zbl 1020.34032
Ortega, Rafael |
|
1998
|
Periodic solutions of forced oscillators with several degrees of freedom. Zbl 1041.34003
Ortega, Rafael; Sánchez, Luis A. |
|
2002
|
Nonexistence of radial solutions of two elliptic boundary value problems. Zbl 0721.35022
Ortega, Rafael |
|
1990
|
Variations on Lyapunov’s stability criterion and periodic prey-predator systems. Zbl 1493.34153
Ortega, Rafael |
|
2021
|
On a family of Kepler problems with linear dissipation. Zbl 1473.70028
Margheri, Alessandro; Ortega, Rafael; Rebelo, Carlota |
|
2017
|
Periodic motions in forced problems of Kepler type. Zbl 1246.34035
Amster, Pablo; Haddad, Julián; Ortega, Rafael; Ureña, Antonio J. |
|
2011
|
Point-vortex stability under the influence of an external periodic flow. Zbl 1393.37068
Ortega, Rafael; Ortega, Víctor; Torres, Pedro J. |
|
2018
|
First integrals for the Kepler problem with linear drag. Zbl 1374.70025
Margheri, Alessandro; Ortega, Rafael; Rebelo, Carlota |
|
2017
|
A homotopical property of attractors. Zbl 1362.37036
Ortega, Rafael; Sánchez-Gabites, Jaime J. |
|
2015
|
Instability of periodic solutions obtained by minimization. Zbl 1210.37042
Ortega, Rafael |
|
2004
|
On the number of solutions to semilinear boundary value problem. Zbl 1142.35425
Kunze, Markus; Ortega, Rafael |
|
2004
|
A finite difference approach to the equations of age-dependent population dynamics. Zbl 0677.65142
Kannan, Rangachary; Ortega, Rafael |
|
1989
|
Stability and index of periodic solutions of a nonlinear telegraph equation. Zbl 1089.37046
Ortega, Rafael |
|
2005
|
Attractors with irrational rotation number. Zbl 1267.37040
Hernández-Corbato, Luis; Ortega, Rafael; Ruiz del Portal, Francisco R. |
|
2012
|
Stability of periodic solutions of Hamiltonian systems with low dimension. Zbl 1440.37059
Ortega, Rafael |
|
2017
|
Functions with average and bounded motions of a forced discontinuous oscillator. Zbl 1443.34020
Enguiça, Ricardo; Ortega, Rafael |
|
2019
|
Smooth linearisation of planar periodic maps. Zbl 1423.37027
Cima, A.; Gasull, A.; Mañosas, F.; Ortega, R. |
|
2019
|
A forced pendulum equation without stable periodic solutions of a fixed period. Zbl 1323.34057
Ortega, Rafael |
|
2014
|
A two-point boundary value problem associated with Hamiltonian systems on a cylinder. Zbl 1533.37131
Fonda, Alessandro; Ortega, Rafael |
|
2023
|
Regularized variational principles for the perturbed Kepler problem. Zbl 1482.70016
Barutello, Vivina; Ortega, Rafael; Verzini, Gianmaria |
|
2021
|
Generalized periodic orbits in some restricted three-body problems. Zbl 1498.70015
Ortega, Rafael; Zhao, Lei |
|
2021
|
Variations on Lyapunov’s stability criterion and periodic prey-predator systems. Zbl 1493.34153
Ortega, Rafael |
|
2021
|
Escaping orbits are rare in the quasi-periodic Fermi-Ulam ping-pong. Zbl 1437.37028
Kunze, Markus; Ortega, Rafael |
|
2020
|
Some rigorous results on the 1:1 resonance of the spin-orbit problem. Zbl 1476.70051
Misquero, Mauricio; Ortega, Rafael |
|
2020
|
Periodic differential equations in the plane. A topological perspective. Zbl 1427.34052
Ortega, Rafael |
|
2019
|
Periodic solutions and regularization of a Kepler problem with time-dependent perturbation. Zbl 1422.37041
Boscaggin, Alberto; Ortega, Rafael; Zhao, Lei |
|
2019
|
Functions with average and bounded motions of a forced discontinuous oscillator. Zbl 1443.34020
Enguiça, Ricardo; Ortega, Rafael |
|
2019
|
Smooth linearisation of planar periodic maps. Zbl 1423.37027
Cima, A.; Gasull, A.; Mañosas, F.; Ortega, R. |
|
2019
|
Periodic oscillators, isochronous centers and resonance. Zbl 1411.34051
Ortega, Rafael; Rojas, David |
|
2019
|
A proof of Bertrand’s theorem using the theory of isochronous potentials. Zbl 1481.34046
Ortega, Rafael; Rojas, David |
|
2019
|
Stability of periodic solutions of the \(N\)-vortex problem in general domains. Zbl 1436.37065
Gebhard, Björn; Ortega, Rafael |
|
2019
|
Point-vortex stability under the influence of an external periodic flow. Zbl 1393.37068
Ortega, Rafael; Ortega, Víctor; Torres, Pedro J. |
|
2018
|
On a family of Kepler problems with linear dissipation. Zbl 1473.70028
Margheri, Alessandro; Ortega, Rafael; Rebelo, Carlota |
|
2017
|
First integrals for the Kepler problem with linear drag. Zbl 1374.70025
Margheri, Alessandro; Ortega, Rafael; Rebelo, Carlota |
|
2017
|
Stability of periodic solutions of Hamiltonian systems with low dimension. Zbl 1440.37059
Ortega, Rafael |
|
2017
|
Symmetric periodic solutions in the Sitnikov problem. Zbl 1354.34072
Ortega, Rafael |
|
2016
|
Periodic solutions of a perturbed Kepler problem in the plane: from existence to stability. Zbl 1343.37045
Boscaggin, Alberto; Ortega, Rafael |
|
2016
|
A homotopical property of attractors. Zbl 1362.37036
Ortega, Rafael; Sánchez-Gabites, Jaime J. |
|
2015
|
Linearization of planar involutions in \(\mathcal C^1\). Zbl 1352.37053
Cima, A.; Gasull, A.; Mañosas, F.; Ortega, R. |
|
2015
|
Monotone twist maps and periodic solutions of systems of Duffing type. Zbl 1331.34070
Boscaggin, Alberto; Ortega, Rafael |
|
2014
|
Subharmonic solutions of the forced pendulum equation: a symplectic approach. Zbl 1303.34028
Boscaggin, A.; Ortega, R.; Zanolin, F. |
|
2014
|
Dynamics of Kepler problem with linear drag. Zbl 1298.70010
Margheri, Alessandro; Ortega, Rafael; Rebelo, Carlota |
|
2014
|
A forced pendulum equation without stable periodic solutions of a fixed period. Zbl 1323.34057
Ortega, Rafael |
|
2014
|
Twist mappings with non-periodic angles. Zbl 1326.37032
Kunze, Markus; Ortega, Rafael |
|
2013
|
Prevalence of non-degenerate periodic solutions in the forced pendulum equation. Zbl 1278.34042
Ortega, Rafael |
|
2013
|
Long-time stability estimates for the non-periodic Littlewood boundedness problem. Zbl 1272.34043
Kunze, Markus; Ortega, Rafael |
|
2013
|
Stable periodic solutions in the forced pendulum equation. Zbl 1303.34031
Ortega, Rafael |
|
2013
|
Some analytical results about periodic orbits in the restricted three body problem with dissipation. Zbl 1266.70014
Margheri, Alessandro; Ortega, Rafael; Rebelo, Carlota |
|
2012
|
Persistence of equilibria as periodic solutions of forced systems. Zbl 1237.34077
Buică, Adriana; Ortega, Rafael |
|
2012
|
Attractors with irrational rotation number. Zbl 1267.37040
Hernández-Corbato, Luis; Ortega, Rafael; Ruiz del Portal, Francisco R. |
|
2012
|
The complex periodic problem for a Riccati equation. Zbl 1274.34128
Ortega, Rafael |
|
2012
|
Index and persistence of stable Cantor sets. Zbl 1268.37069
Ortega, Rafael; Ruiz-Herrera, Alfonso |
|
2012
|
Linear motions in a periodically forced Kepler problem. Zbl 1235.34136
Ortega, Rafael |
|
2011
|
Complete orbits for twist maps on the plane: extensions and applications. Zbl 1228.37035
Kunze, Markus; Ortega, Rafael |
|
2011
|
Complete orbits for twist maps on the plane: the case of small twist. Zbl 1276.37035
Kunze, Markus; Ortega, Rafael |
|
2011
|
Attractors with vanishing rotation number. Zbl 1253.37048
Ortega, Rafael; Ruiz del Portal, Francisco R. |
|
2011
|
Asymptotic stability of forced oscillations emanating from a limit cycle. Zbl 1213.34060
Makarenkov, Oleg; Ortega, Rafael |
|
2011
|
Periodic motions in forced problems of Kepler type. Zbl 1246.34035
Amster, Pablo; Haddad, Julián; Ortega, Rafael; Ureña, Antonio J. |
|
2011
|
A dynamical characterization of planar symmetries. Zbl 1273.37012
Ortega, Rafael |
|
2011
|
Global bifurcations from the center of mass in the Sitnikov problem. Zbl 1380.70028
Ortega, Rafael; Rivera, Andrés |
|
2010
|
The pendulum equation: from periodic to almost periodic forcings. Zbl 1240.34222
Ortega, Rafael |
|
2009
|
On the families of periodic orbits of the Sitnikov problem. Zbl 1159.70010
Llibre, Jaume; Ortega, Rafael |
|
2008
|
Degree theory and almost periodic problems. Zbl 1204.34054
Ortega, Rafael |
|
2008
|
Complete orbits for twist maps on the plane. Zbl 1149.37024
Kunze, Markus; Ortega, Rafael |
|
2008
|
Maximum principles around an eigenvalue with constant eigenfunctions. Zbl 1170.35029
Campos, J.; Mawhin, J.; Ortega, R. |
|
2008
|
Retracts, fixed point index and differential equations. Zbl 1160.34049
Ortega, Rafael |
|
2008
|
Location of fixed points and periodic solutions in the plane. Zbl 1360.34090
Campos, Juan; Ortega, Rafael |
|
2008
|
Topological translations and nonlinear resonance. Zbl 1120.37025
Dambrosio, Walter; Ortega, Rafael |
|
2007
|
Almost periodic linear differential equations with non-separated solutions. Zbl 1108.34008
Ortega, Rafael; Tarallo, Massimo |
|
2006
|
Unbounded motions in forced Newtonian equations. Zbl 1103.34042
Ortega, Rafael |
|
2006
|
Optimal bounds for bifurcation values of a superlinear periodic problem. Zbl 1088.34036
Ortega, Rafael; Zhang, Meirong |
|
2005
|
Maximum principles for bounded solutions of the telegraph equation in space dimensions two and three and applications. Zbl 1082.35040
Mawhin, Jean; Ortega, Rafael; Robles-Pérez, Aureliano M. |
|
2005
|
Stability and index of periodic solutions of a nonlinear telegraph equation. Zbl 1089.37046
Ortega, Rafael |
|
2005
|
A variational method for the existence of bounded solutions of a sublinear forced oscillator. Zbl 1072.34038
Ortega, Rafael; Verzini, Gianmaria |
|
2004
|
Instability of periodic solutions obtained by minimization. Zbl 1210.37042
Ortega, Rafael |
|
2004
|
On the number of solutions to semilinear boundary value problem. Zbl 1142.35425
Kunze, Markus; Ortega, Rafael |
|
2004
|
The first 60 years of nonlinear analysis of Jean Mawhin. Papers from the conference, Sevilla, Spain, April 2003. Zbl 1064.35002
|
|
2004
|
Almost periodic upper and lower solutions. Zbl 1043.34046
Ortega, Rafael; Tarallo, Massimo |
|
2003
|
Differential equations with limit-periodic forcings. Zbl 1021.34015
Alonso, Ana I.; Obaya, Rafael; Ortega, Rafael |
|
2003
|
Almost periodic equations and conditions of Ambrosetti-Prodi type. Zbl 1055.34085
Ortega, Rafael; Tarallo, Massimo |
|
2003
|
Dynamics of a forced oscillator having an obstacle. Zbl 1054.34057
Ortega, R. |
|
2002
|
Periodic perturbations of an isochronous center. Zbl 1043.34049
Ortega, Rafael |
|
2002
|
Massera’s theorem for quasi-periodic differential equations. Zbl 1005.37021
Ortega, Rafael; Tarallo, Massimo |
|
2002
|
Periodic solutions of forced oscillators with several degrees of freedom. Zbl 1041.34003
Ortega, Rafael; Sánchez, Luis A. |
|
2002
|
A maximum principle for bounded solutions of the telegraph equation in space dimension three. Zbl 1002.35027
Mawhin, Jean; Ortega, Rafael; Robles-Pérez, Aureliano M. |
|
2002
|
Invariant curves of mappings with averaged small twist. Zbl 1136.37336
Ortega, Rafael |
|
2001
|
A duality theorem for periodic solutions of a class of second order evolution equations. Zbl 1010.34054
Ortega, Rafael; Robles-Pérez, Aureliano M. |
|
2001
|
Twist mappings, invariant curves and periodic differential equations. Zbl 1172.34326
Ortega, Rafael |
|
2001
|
A maximum principle for bounded solutions of the telegraph equations and applications to nonlinear forcings. Zbl 0972.35016
Mawhin, Jean; Ortega, Rafael; Robles-Pérez, Aureliano M. |
|
2000
|
Parabolic fixed points and stability criteria for nonlinear Hill’s equation. Zbl 0973.34046
Núñez, Daniel; Ortega, Rafael |
|
2000
|
Abstract competitive systems and orbital stability in \(\mathbb R^3\). Zbl 0951.34032
Ortega, Rafael; Sánchez, Luis Ángel |
|
2000
|
Non-continuation of the periodic oscillations of a forced pendulum in the presence of friction. Zbl 0970.34037
Ortega, Rafael; Serra, Enrico; Tarallo, Massimo |
|
2000
|
Degenerate equations of pendulum-type. Zbl 0958.34033
Ortega, Rafael; Tarallo, Massimo |
|
2000
|
Positively homogeneous equations in the plane. Zbl 1079.34011
Fonda, Alessandro; Ortega, Rafael |
|
2000
|
Counting periodic solutions of the forced pendulum equation. Zbl 0967.34037
Ortega, Rafael |
|
2000
|
Boundedness in a piecewise linear oscillator and a variant of the small twist theorem. Zbl 1030.34035
Ortega, Rafael |
|
1999
|
Bounded solutions of second order semilinear evolution equations and applications to the telegraph equation. Zbl 0927.34048
Alonso, Jose Miguel; Mawhin, Jean; Ortega, Rafael |
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1999
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Roots of unity and unbounded motions of an asymmetric oscillator. Zbl 0899.34023
Alonso, José Miguel; Ortega, Rafael |
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1998
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A maximum principle for periodic solutions of the telegraph equation. Zbl 0932.35016
Ortega, Rafael; Robles-Pérez, Aureliano M. |
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1998
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The number of stable periodic solutions of time-dependent Hamiltonian systems with one degree of freedom. Zbl 0946.34036
Ortega, Rafael |
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1998
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An exclusion principle for periodic competitive systems in three dimensions. Zbl 0901.34049
Ortega, Rafael; Tineo, Antonio |
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1998
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On Littlewood’s problem for the asymmetric oscillator. Zbl 1020.34032
Ortega, Rafael |
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1998
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Homeomorphisms of the disk with trivial dynamics and extinction of competitive systems. Zbl 0886.34025
Campos, Juan; Ortega, Rafael; Tineo, Antonio |
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1997
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A forced pendulum equation with many periodic solutions. Zbl 0899.34031
Ortega, Rafael |
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1997
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Nonexistence of invariant curves of mappings with small twist. Zbl 0907.58058
Ortega, Rafael |
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1997
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Asymmetric oscillators and twist mappings. Zbl 0860.34017
Ortega, Rafael |
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1996
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The periodic predator-prey Lotka-Volterra model. Zbl 0849.34026
López-Gómez, Julián; Ortega, Rafael; Tineo, Antonio |
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1996
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Periodic solutions of a Newtonian equation: Stability by the third approximation. Zbl 0855.34058
Ortega, Rafael |
|
1996
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Unbounded solutions of semilinear equations at resonance. Zbl 0896.34026
Alonso, José Miguel; Ortega, Rafael |
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1996
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A criterion for asymptotic stability based on topological degree. Zbl 0846.34056
Ortega, Rafael |
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1996
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Nonexistence of periodic solutions of a complex Riccati equation. Zbl 0842.34046
Campos, Juan; Ortega, Rafael |
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1996
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Resonance and non-resonance in a problem of boundedness. Zbl 0858.34018
Ortega, Rafael; Tineo, Antonio |
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1996
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Some applications of the topological degree to stability theory. Zbl 0834.34058
Ortega, Rafael |
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1995
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Boundedness and global asymptotic stability of a forced oscillator. Zbl 0826.34043
Alonso, Jose Miguel; Ortega, Rafael |
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1995
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On the spectrum of some linear noncooperative elliptic systems with radial symmetry. Zbl 0841.35031
Dancer, E. N.; López-Gómez, J.; Ortega, R. |
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1995
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Global asymptotic stability of a forced Newtonian system with dissipation. Zbl 0844.34047
Alonso, José Miguel; Ortega, Rafael |
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1995
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On the number of positive periodic solutions for planar competing Lotka-Volterra systems. Zbl 0903.34037
Ortega, Rafael; Tineo, Antonio |
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1995
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A boundedness result of Landesman-Lazer type. Zbl 0817.34017
Ortega, Rafael |
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1995
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| ...and 22 more Documents |
