Edit Profile (opens in new tab) Fonda, Alessandro Co-Author Distance Author ID: fonda.alessandro Published as: Fonda, Alessandro; Fonda, A. External Links: MGP · ORCID Documents Indexed: 107 Publications since 1986, including 3 Books 3 Contributions as Editor Reviewing Activity: 189 Reviews Co-Authors: 35 Co-Authors with 95 Joint Publications 668 Co-Co-Authors all top 5 Co-Authors 15 single-authored 16 Sfecci, Andrea 13 Toader, Rodica 10 Fabry, Christian 10 Zanolin, Fabio 7 Garrione, Maurizio 7 Klun, Giuliano 7 Mawhin, Jean L. 5 Gidoni, Paolo 4 Ureña, Antonio J. 3 Cañada Villar, Antonio 3 Colombo, Giovanni 3 Drábek, Pavel 3 Gossez, Jean-Pierre 3 Obersnel, Franco 3 Ortega, Rafael 3 Torres, Pedro José 3 Willem, Michel 2 Boscaggin, Alberto 2 Cellina, Arrigo 2 Gallo, Anna Chiara 2 Ghirardelli, Luca 2 Mamo, Natnael Gezahegn 2 Munyamarere, François 2 Ramos, Miguel 2 Schneider, Zdenek 1 Buttazzoni, Paola 1 Garzón, Manuel 1 Habets, Patrick 1 Lazer, Alan C. 1 Lupo, Daniela 1 Manasevich, Raul F. 1 Ornelas, António 1 Sabatini, Marco 1 Schmitt, Klaus 1 Ullah, Wahid all top 5 Serials 15 Journal of Differential Equations 7 Nonlinear Analysis. Theory, Methods & Applications. Series A: Theory and Methods 7 Topological Methods in Nonlinear Analysis 7 Discrete and Continuous Dynamical Systems 6 Proceedings of the American Mathematical Society 6 Advanced Nonlinear Studies 4 Annali di Matematica Pura ed Applicata. Serie Quarta 4 Differential and Integral Equations 3 Proceedings of the Royal Society of Edinburgh. Section A. Mathematics 3 NoDEA. Nonlinear Differential Equations and Applications 3 Handbook of Differential Equations 2 Journal of Mathematical Analysis and Applications 2 Annales de l’Institut Henri Poincaré. Analyse Non Linéaire 2 Celestial Mechanics and Dynamical Astronomy 2 Rapport. Séminaire de Mathématique. Nouvelle Série 2 Mediterranean Journal of Mathematics 2 Advances in Nonlinear Analysis 2 Nonlinear Analysis. Theory, Methods & Applications 1 Israel Journal of Mathematics 1 Mathematics Magazine 1 Archiv der Mathematik 1 Bulletin of the London Mathematical Society 1 Commentationes Mathematicae Universitatis Carolinae 1 Journal of Computational and Applied Mathematics 1 Publicationes Mathematicae Debrecen 1 Rendiconti del Circolo Matemàtico di Palermo. Serie II 1 Bulletin de la Classe des Sciences. 5e Série 1 Journal de Mathématiques Pures et Appliquées. Neuvième Série 1 SIAM Journal on Mathematical Analysis 1 Bollettino della Unione Matemàtica Italiana. Serie VII. A 1 Journal of Dynamics and Differential Equations 1 Mémoire de la Classe des Sciences. Collection Octavo. 3e Série 1 Advances in Differential Equations 1 Communications in Contemporary Mathematics 1 Nonlinear Analysis. Real World Applications 1 Portugaliae Mathematica. Nova Série 1 Comptes Rendus. Mathématique. Académie des Sciences, Paris 1 Annali della Scuola Normale Superiore di Pisa. Classe di Scienze. Serie V 1 Journal of Fixed Point Theory and Applications 1 Ars Mathematica Contemporanea 1 Pure and Applied Functional Analysis 1 Compact Textbooks in Mathematics 1 Birkhäuser Advanced Texts. Basler Lehrbücher all top 5 Fields 80 Ordinary differential equations (34-XX) 35 Dynamical systems and ergodic theory (37-XX) 27 Operator theory (47-XX) 10 Partial differential equations (35-XX) 10 Mechanics of particles and systems (70-XX) 5 Global analysis, analysis on manifolds (58-XX) 4 Calculus of variations and optimal control; optimization (49-XX) 3 General and overarching topics; collections (00-XX) 3 Real functions (26-XX) 3 General topology (54-XX) 2 Measure and integration (28-XX) 2 Geometry (51-XX) 2 Numerical analysis (65-XX) 2 Biology and other natural sciences (92-XX) 1 History and biography (01-XX) 1 Potential theory (31-XX) 1 Algebraic topology (55-XX) 1 Mechanics of deformable solids (74-XX) Publications by Year all cited Publications top 5 cited Publications Citations contained in zbMATH Open 94 Publications have been cited 1,146 times in 614 Documents Cited by ▼ Year ▼ Subharmonic solutions for some second-order differential equations with singularities. Zbl 0787.34035 Fonda, Alessandro; Manásevich, Raúl; Zanolin, Fabio 94 1993 Uniformly persistent semidynamical systems. Zbl 0667.34065 Fonda, Alessandro 49 1988 Periodic orbits of radially symmetric Keplerian-like systems: a topological degree approach. Zbl 1168.34031 Fonda, Alessandro; Toader, Rodica 44 2008 Handbook of differential equations: Ordinary differential equations. Vol. III. Zbl 1107.34002 41 2006 A higher dimensional Poincaré-Birkhoff theorem for Hamiltonian flows. Zbl 1442.37076 Fonda, Alessandro; Ureña, Antonio J. 37 2017 Periodic solutions of perturbed Hamiltonian systems in the plane by the use of the Poincaré-Birkhoff theorem. Zbl 1277.34046 Fonda, Alessandro; Sabatini, Marco; Zanolin, Fabio 34 2012 Nonlinear resonance in asymmetric oscillators. Zbl 0915.34033 Fabry, Christian; Fonda, Alessandro 33 1998 Periodic solutions of asymptotically positively homogeneous differential equations. Zbl 0692.34041 Fonda, Alessandro; Habets, Patrick 32 1989 Subharmonic solutions of conservative systems with nonconvex potentials. Zbl 0752.34027 Fonda, A.; Lazer, A. C. 27 1992 Periodic solutions of weakly coupled superlinear systems. Zbl 1351.34046 Fonda, Alessandro; Sfecci, Andrea 27 2016 Periodic solutions of radially symmetric perturbations of Newtonian systems. Zbl 1248.34051 Fonda, Alessandro; Toader, Rodica 26 2012 Periodic, subharmonic, and quasi-periodic oscillations under the action of a central force. Zbl 1231.34073 Fonda, Alessandro; Ureña, Antonio J. 23 2011 Periodic perturbations of Hamiltonian systems. Zbl 1353.37124 Fonda, Alessandro; Garrione, Maurizio; Gidoni, Paolo 23 2016 Radially symmetric systems with a singularity and asymptotically linear growth. Zbl 1218.34047 Fonda, Alessandro; Toader, Rodica 22 2011 On the use of time-maps for the solvability of nonlinear boundary value problems. Zbl 0766.34012 Fonda, Alessandro; Zanolin, Fabio 22 1992 Periodic oscillations for a nonlinear suspension bridge model. Zbl 0810.73030 Fonda, Alessandro; Schneider, Zdenek; Zanolin, Fabio 20 1994 Periodic solutions of nonlinear differential equations with double resonance. Zbl 0729.34025 Fabry, C.; Fonda, A. 20 1990 Guiding functions and periodic solutions to functional differential equations. Zbl 0616.34038 Fonda, Alessandro 19 1987 Subharmonic oscillations of forced pendulum-type equations. Zbl 0708.34028 Fonda, A.; Willem, M. 19 1989 A general method for the existence of periodic solutions of differential systems in the plane. Zbl 1237.34079 Fonda, Alessandro; Sfecci, Andrea 18 2012 Positively homogeneous Hamiltonian systems in the plane. Zbl 1068.34035 Fonda, Alessandro 18 2004 Large-amplitude subharmonic oscillations for scalar second-order differential equations with asymmetric nonlinearities. Zbl 0798.34048 Fonda, A.; Ramos, M. 18 1994 On a singular periodic Ambrosetti-Prodi problem. Zbl 1385.34030 Fonda, Alessandro; Sfecci, Andrea 18 2017 Periodic orbits of radially symmetric systems with a singularity: the repulsive case. Zbl 1241.34048 Fonda, Alessandro; Toader, Rodica 17 2011 Periodic solutions of singular radially symmetric systems with superlinear growth. Zbl 1251.34056 Fonda, Alessandro; Toader, Rodica; Zanolin, Fabio 17 2012 Quadratic forms, weighted eigenfunctions and boundary value problems for nonlinear second order ordinary differential equations. Zbl 0677.34022 Fonda, Alessandro; Mawhin, Jean 16 1989 Subharmonic solutions of Hamiltonian systems displaying some kind of sublinear growth. Zbl 1419.37059 Fonda, Alessandro; Toader, Rodica 16 2019 Generalizing the Poincaré-Miranda theorem: the avoiding cones condition. Zbl 1386.55004 Fonda, Alessandro; Gidoni, Paolo 15 2016 Double resonance with Landesman-Lazer conditions for planar systems of ordinary differential equations. Zbl 1227.34037 Fonda, Alessandro; Garrione, Maurizio 14 2011 Subharmonic solutions for second order differential equations. Zbl 0803.34029 Fonda, A.; Ramos, M.; Willem, M. 14 1993 Periodic solutions of pendulum-like Hamiltonian systems in the plane. Zbl 1264.34078 Fonda, Alessandro; Toader, Rodica 12 2012 Lower semicontinuous perturbations of maximal monotone differential inclusions. Zbl 0661.47038 Colombo, Giovanni; Fonda, Alessandro; Ornelas, António 11 1988 Iterative and variational methods for the solvability of some semilinear equations in Hilbert spaces. Zbl 0761.34047 Fonda, Alessandro; Mawhin, Jean 11 1992 A Landesman-Lazer type condition for asymptotically linear second-order equations with a singularity. Zbl 1400.34063 Fonda, Alessandro; Garrione, Maurizio 11 2012 Periodic solutions of a system of coupled oscillators with one-sided superlinear retraction forces. Zbl 1274.34125 Fonda, Alessandro; Sfecci, Andrea 11 2012 Planar differential systems at resonance. Zbl 1155.34020 Fonda, Alessandro; Mawhin, Jean 10 2006 Nonlinear resonance: a comparison between Landesman-Lazer and Ahmad-Lazer-Paul conditions. Zbl 1222.34024 Fonda, Alessandro; Garrione, Maurizio 10 2011 Periodic solutions for a conservative system of differential equations with a singularity of repulsive type. Zbl 0830.34033 Fonda, Alessandro 10 1995 Periodic solutions of perturbed isochronous Hamiltonian systems at resonance. Zbl 1080.34020 Fabry, Christian; Fonda, Alessandro 10 2005 Multiple periodic solutions of conservative systems with periodic nonlinearity. Zbl 0718.34054 Fonda, A.; Mawhin, J. 10 1989 Playing around resonance. An invitation to the search of periodic solutions for second order ordinary differential equations. Zbl 1364.34004 Fonda, Alessandro 10 2016 Periodic solutions of scalar second order differential equations with a singularity. Zbl 1221.34110 Fonda, Alessandro 9 1993 Unbounded motions of perturbed isochronous Hamiltonian systems at resonance. Zbl 1088.34027 Fabry, Christian; Fonda, Alessandro 9 2005 On the existence of periodic solutions for scalar second order differential equations when only the asymptotic behaviour of the potential is known. Zbl 0782.34047 Fonda, Alessandro 9 1993 Multiple periodic solutions of Hamiltonian systems confined in a box. Zbl 1373.37147 Fonda, Alessandro; Sfecci, Andrea 9 2017 Well-ordered and non-well-ordered lower and upper solutions for periodic planar systems. Zbl 1471.34074 Fonda, Alessandro; Klun, Giuliano; Sfecci, Andrea 9 2021 Multiple periodic solutions of scalar second order differential equations. Zbl 1245.34049 Fonda, Alessandro; Ghirardelli, Luca 8 2010 Handbook of differential equations: Ordinary differential equations. Vol. I. Zbl 1067.34001 8 2004 An avoiding cones condition for the Poincaré-Birkhoff theorem. Zbl 1369.37064 Fonda, Alessandro; Gidoni, Paolo 8 2017 Radial periodic perturbations of the Kepler problem. Zbl 1375.34067 Fonda, Alessandro; Gallo, Anna Chiara 8 2017 A dynamical approach to lower and upper solutions for planar systems. “To the memory of Massimo Tarallo”. Zbl 1478.34043 Fonda, Alessandro; Toader, Rodica 8 2021 Multiple periodic solutions of Hamiltonian systems in the plane. Zbl 1221.34111 Fonda, Alessandro; Ghirardelli, Luca 7 2010 Periodic perturbations with rotational symmetry of planar systems driven by a central force. Zbl 1392.34045 Fonda, Alessandro; Gallo, Anna Chiara 7 2018 Periodic oscillations of forced pendulums with very small length. Zbl 0865.34033 Fonda, Alessandro; Zanolin, Fabio 7 1997 Coupling linearity and twist: an extension of the Poincaré-Birkhoff theorem for Hamiltonian systems. Zbl 1454.37057 Fonda, Alessandro; Gidoni, Paolo 7 2020 Periodic solutions of second-order differential equations in Hilbert spaces. Zbl 1482.34110 Fonda, Alessandro; Klun, Giuliano; Sfecci, Andrea 7 2021 Periodic bouncing solutions for nonlinear impact oscillators. Zbl 1278.34039 Fonda, Alessandro; Sfecci, Andrea 7 2013 Periodic solutions to second order differential equations of Liénard type with jumping nonlinearities. Zbl 0625.34046 Fonda, Alessandro; Zanolin, Fabio 6 1987 Handbook of differential equations: Ordinary differential equations. Vol. II. Zbl 1074.34003 6 2005 Semicoercive variational problems at resonance: An abstract approach. Zbl 0727.35056 Fonda, A.; Gossez, J.-P. 6 1990 A higher-dimensional Poincaré-Birkhoff theorem without monotone twist. (Un théorème de Poincaré-Birkhoff en plusieurs dimensions sans torsion monotone.) Zbl 1382.37054 Fonda, Alessandro; Ureña, Antonio J. 6 2016 Periodic motions in a gravitational central field with a rotating external force. Zbl 1266.34070 Fonda, Alessandro; Toader, Rodica; Torres, Pedro J. 6 2012 A Poincaré-Birkhoff theorem for Hamiltonian flows on nonconvex domains. Zbl 1423.37056 Fonda, Alessandro; Ureña, Antonio J. 5 2019 An infinite-dimensional version of the Poincaré-Birkhoff theorem on the Hilbert cube. Zbl 07328847 Boscaggin, Alberto; Fonda, Alessandro; Garrione, Maurizio 5 2020 Periodic perturbations of scalar second order differential equations. Zbl 0951.34024 Buttazzoni, Paola; Fonda, Alessandro 4 1997 Bounded solutions of nonlinear second order ordinary differential equations. Zbl 0954.34027 Fonda, Alessandro; Zanolin, Fabio 4 1998 On a nonresonance condition for a semilinear elliptic problem. Zbl 0735.35054 Fonda, Alessandro; Gossez, Jean-Pierre; Zanolin, Fabio 4 1991 Nonlinear equations at resonance and generalized eigenvalue problems. Zbl 0756.34079 Fabry, C.; Fonda, A. 4 1992 An iterative method for the solvability of semilinear equations in Hilbert spaces and applications. Zbl 0813.47077 Fonda, A.; Mawhin, J. 4 1992 A multiplicity result for periodic solutions of second-order differential equations with a singularity. Zbl 1278.34038 Boscaggin, Alberto; Fonda, Alessandro; Garrione, Maurizio 4 2012 A continuous version of Liapunov’s convexity theorem. Zbl 0647.28002 Cellina, Arrigo; Colombo, Giovanni; Fonda, Alessandro 3 1988 Bifurcations from infinity in asymmetric nonlinear oscillators. Zbl 0979.34033 Fabry, Christian; Fonda, Alessandro 3 2000 Positively homogeneous equations in the plane. Zbl 1079.34011 Fonda, Alessandro; Ortega, Rafael 3 2000 Lower and upper solutions to semilinear boundary value problems: an abstract approach. Zbl 1243.35030 Fonda, Alessandro; Toader, Rodica 3 2011 Semilinear equations at resonance with non-symmetric linear part. Zbl 0859.47041 Fabry, C.; Fonda, A.; Munyamarere, F. 3 1993 Two-point boundary value problems for planar systems: a lower and upper solutions approach. Zbl 1492.34023 Fonda, Alessandro; Sfecci, Andrea; Toader, Rodica 3 2022 Periodic solutions of nearly integrable Hamiltonian systems bifurcating from infinite-dimensional tori. Zbl 1451.37092 Fonda, Alessandro; Klun, Giuliano; Sfecci, Andrea 3 2020 Multiple periodic solutions of infinite-dimensional pendulum-like equations. Zbl 1457.34066 Fonda, Alessandro; Mawhin, Jean; Willem, Michel 3 2020 Generalized Sturm Liouville boundary conditions for first order differential systems in the plane. Zbl 1312.34054 Fonda, Alessandro; Garrione, Maurizio 3 2013 Topological degree and generalized asymmetric oscillators. Zbl 1105.37036 Fonda, Alessandro 2 2006 Approximate selections and fixed points for upper semicontinuous maps with decomposable values. Zbl 0606.54018 Cellina, Arrigo; Colombo, Giovanni; Fonda, Alessandro 2 1986 An extension of the Poincaré-Birkhoff theorem coupling twist with lower and upper solutions. Zbl 07732459 Fonda, Alessandro; Garzón, Manuel; Sfecci, Andrea 2 2023 On the Dirichlet problem associated with bounded perturbations of positively-\((p, q)\)-homogeneous Hamiltonian systems. Zbl 1525.34049 Fonda, Alessandro; Klun, Giuliano; Obersnel, Franco; Sfecci, Andrea 2 2022 Periodic oscillations for a suspension bridge model. (Abstract). Zbl 0850.34019 Fonda, A.; Schneider, Z.; Zanolin, F. 1 1992 Asymmetric nonlinear oscillators. Zbl 0993.34037 Fabry, Christian; Fonda, Alessandro 1 2001 Periodic solutions of second order ordinary differential equations. Zbl 0706.34038 Fonda, Alessandro; Lupo, Daniela 1 1989 A permanence theorem for local dynamical systems. Zbl 1373.37082 Fonda, Alessandro; Gidoni, Paolo 1 2015 On the topological degree of planar maps avoiding normal cones. Zbl 07130721 Fonda, Alessandro; Klun, Giuliano 1 2019 A two-point boundary value problem associated with Hamiltonian systems on a cylinder. Zbl 07783227 Fonda, Alessandro; Ortega, Rafael 1 2023 A systematic approach to nonresonance conditions for periodically forced planar Hamiltonian systems. Zbl 1501.34040 Fabry, Christian; Fonda, Alessandro 1 2022 The Kurzweil-Henstock integral for undergraduates. A promenade along the marvelous theory of integration. Zbl 1410.26007 Fonda, Alessandro 1 2018 A lower/upper solutions result for generalised radial \(p\)-Laplacian boundary value problems. Zbl 1506.34040 Fonda, Alessandro; Mamo, Natnael Gezahegn; Obersnel, Franco; Sfecci, Andrea 1 2023 A generalization of the parallelogram law to higher dimensions. Zbl 1423.51009 Fonda, Alessandro 1 2019 Periodic solutions of Hamiltonian systems coupling twist with generalized lower/upper solutions. Zbl 07791810 Fonda, Alessandro; Ullah, Wahid 1 2024 Periodic solutions of Hamiltonian systems coupling twist with generalized lower/upper solutions. Zbl 07791810 Fonda, Alessandro; Ullah, Wahid 1 2024 An extension of the Poincaré-Birkhoff theorem coupling twist with lower and upper solutions. Zbl 07732459 Fonda, Alessandro; Garzón, Manuel; Sfecci, Andrea 2 2023 A two-point boundary value problem associated with Hamiltonian systems on a cylinder. Zbl 07783227 Fonda, Alessandro; Ortega, Rafael 1 2023 A lower/upper solutions result for generalised radial \(p\)-Laplacian boundary value problems. Zbl 1506.34040 Fonda, Alessandro; Mamo, Natnael Gezahegn; Obersnel, Franco; Sfecci, Andrea 1 2023 Two-point boundary value problems for planar systems: a lower and upper solutions approach. Zbl 1492.34023 Fonda, Alessandro; Sfecci, Andrea; Toader, Rodica 3 2022 On the Dirichlet problem associated with bounded perturbations of positively-\((p, q)\)-homogeneous Hamiltonian systems. Zbl 1525.34049 Fonda, Alessandro; Klun, Giuliano; Obersnel, Franco; Sfecci, Andrea 2 2022 A systematic approach to nonresonance conditions for periodically forced planar Hamiltonian systems. Zbl 1501.34040 Fabry, Christian; Fonda, Alessandro 1 2022 Well-ordered and non-well-ordered lower and upper solutions for periodic planar systems. Zbl 1471.34074 Fonda, Alessandro; Klun, Giuliano; Sfecci, Andrea 9 2021 A dynamical approach to lower and upper solutions for planar systems. “To the memory of Massimo Tarallo”. Zbl 1478.34043 Fonda, Alessandro; Toader, Rodica 8 2021 Periodic solutions of second-order differential equations in Hilbert spaces. Zbl 1482.34110 Fonda, Alessandro; Klun, Giuliano; Sfecci, Andrea 7 2021 Coupling linearity and twist: an extension of the Poincaré-Birkhoff theorem for Hamiltonian systems. Zbl 1454.37057 Fonda, Alessandro; Gidoni, Paolo 7 2020 An infinite-dimensional version of the Poincaré-Birkhoff theorem on the Hilbert cube. Zbl 07328847 Boscaggin, Alberto; Fonda, Alessandro; Garrione, Maurizio 5 2020 Periodic solutions of nearly integrable Hamiltonian systems bifurcating from infinite-dimensional tori. Zbl 1451.37092 Fonda, Alessandro; Klun, Giuliano; Sfecci, Andrea 3 2020 Multiple periodic solutions of infinite-dimensional pendulum-like equations. Zbl 1457.34066 Fonda, Alessandro; Mawhin, Jean; Willem, Michel 3 2020 Subharmonic solutions of Hamiltonian systems displaying some kind of sublinear growth. Zbl 1419.37059 Fonda, Alessandro; Toader, Rodica 16 2019 A Poincaré-Birkhoff theorem for Hamiltonian flows on nonconvex domains. Zbl 1423.37056 Fonda, Alessandro; Ureña, Antonio J. 5 2019 On the topological degree of planar maps avoiding normal cones. Zbl 07130721 Fonda, Alessandro; Klun, Giuliano 1 2019 A generalization of the parallelogram law to higher dimensions. Zbl 1423.51009 Fonda, Alessandro 1 2019 Periodic perturbations with rotational symmetry of planar systems driven by a central force. Zbl 1392.34045 Fonda, Alessandro; Gallo, Anna Chiara 7 2018 The Kurzweil-Henstock integral for undergraduates. A promenade along the marvelous theory of integration. Zbl 1410.26007 Fonda, Alessandro 1 2018 A higher dimensional Poincaré-Birkhoff theorem for Hamiltonian flows. Zbl 1442.37076 Fonda, Alessandro; Ureña, Antonio J. 37 2017 On a singular periodic Ambrosetti-Prodi problem. Zbl 1385.34030 Fonda, Alessandro; Sfecci, Andrea 18 2017 Multiple periodic solutions of Hamiltonian systems confined in a box. Zbl 1373.37147 Fonda, Alessandro; Sfecci, Andrea 9 2017 An avoiding cones condition for the Poincaré-Birkhoff theorem. Zbl 1369.37064 Fonda, Alessandro; Gidoni, Paolo 8 2017 Radial periodic perturbations of the Kepler problem. Zbl 1375.34067 Fonda, Alessandro; Gallo, Anna Chiara 8 2017 Periodic solutions of weakly coupled superlinear systems. Zbl 1351.34046 Fonda, Alessandro; Sfecci, Andrea 27 2016 Periodic perturbations of Hamiltonian systems. Zbl 1353.37124 Fonda, Alessandro; Garrione, Maurizio; Gidoni, Paolo 23 2016 Generalizing the Poincaré-Miranda theorem: the avoiding cones condition. Zbl 1386.55004 Fonda, Alessandro; Gidoni, Paolo 15 2016 Playing around resonance. An invitation to the search of periodic solutions for second order ordinary differential equations. Zbl 1364.34004 Fonda, Alessandro 10 2016 A higher-dimensional Poincaré-Birkhoff theorem without monotone twist. (Un théorème de Poincaré-Birkhoff en plusieurs dimensions sans torsion monotone.) Zbl 1382.37054 Fonda, Alessandro; Ureña, Antonio J. 6 2016 A permanence theorem for local dynamical systems. Zbl 1373.37082 Fonda, Alessandro; Gidoni, Paolo 1 2015 Periodic bouncing solutions for nonlinear impact oscillators. Zbl 1278.34039 Fonda, Alessandro; Sfecci, Andrea 7 2013 Generalized Sturm Liouville boundary conditions for first order differential systems in the plane. Zbl 1312.34054 Fonda, Alessandro; Garrione, Maurizio 3 2013 Periodic solutions of perturbed Hamiltonian systems in the plane by the use of the Poincaré-Birkhoff theorem. Zbl 1277.34046 Fonda, Alessandro; Sabatini, Marco; Zanolin, Fabio 34 2012 Periodic solutions of radially symmetric perturbations of Newtonian systems. Zbl 1248.34051 Fonda, Alessandro; Toader, Rodica 26 2012 A general method for the existence of periodic solutions of differential systems in the plane. Zbl 1237.34079 Fonda, Alessandro; Sfecci, Andrea 18 2012 Periodic solutions of singular radially symmetric systems with superlinear growth. Zbl 1251.34056 Fonda, Alessandro; Toader, Rodica; Zanolin, Fabio 17 2012 Periodic solutions of pendulum-like Hamiltonian systems in the plane. Zbl 1264.34078 Fonda, Alessandro; Toader, Rodica 12 2012 A Landesman-Lazer type condition for asymptotically linear second-order equations with a singularity. Zbl 1400.34063 Fonda, Alessandro; Garrione, Maurizio 11 2012 Periodic solutions of a system of coupled oscillators with one-sided superlinear retraction forces. Zbl 1274.34125 Fonda, Alessandro; Sfecci, Andrea 11 2012 Periodic motions in a gravitational central field with a rotating external force. Zbl 1266.34070 Fonda, Alessandro; Toader, Rodica; Torres, Pedro J. 6 2012 A multiplicity result for periodic solutions of second-order differential equations with a singularity. Zbl 1278.34038 Boscaggin, Alberto; Fonda, Alessandro; Garrione, Maurizio 4 2012 Periodic, subharmonic, and quasi-periodic oscillations under the action of a central force. Zbl 1231.34073 Fonda, Alessandro; Ureña, Antonio J. 23 2011 Radially symmetric systems with a singularity and asymptotically linear growth. Zbl 1218.34047 Fonda, Alessandro; Toader, Rodica 22 2011 Periodic orbits of radially symmetric systems with a singularity: the repulsive case. Zbl 1241.34048 Fonda, Alessandro; Toader, Rodica 17 2011 Double resonance with Landesman-Lazer conditions for planar systems of ordinary differential equations. Zbl 1227.34037 Fonda, Alessandro; Garrione, Maurizio 14 2011 Nonlinear resonance: a comparison between Landesman-Lazer and Ahmad-Lazer-Paul conditions. Zbl 1222.34024 Fonda, Alessandro; Garrione, Maurizio 10 2011 Lower and upper solutions to semilinear boundary value problems: an abstract approach. Zbl 1243.35030 Fonda, Alessandro; Toader, Rodica 3 2011 Multiple periodic solutions of scalar second order differential equations. Zbl 1245.34049 Fonda, Alessandro; Ghirardelli, Luca 8 2010 Multiple periodic solutions of Hamiltonian systems in the plane. Zbl 1221.34111 Fonda, Alessandro; Ghirardelli, Luca 7 2010 Periodic orbits of radially symmetric Keplerian-like systems: a topological degree approach. Zbl 1168.34031 Fonda, Alessandro; Toader, Rodica 44 2008 Handbook of differential equations: Ordinary differential equations. Vol. III. Zbl 1107.34002 41 2006 Planar differential systems at resonance. Zbl 1155.34020 Fonda, Alessandro; Mawhin, Jean 10 2006 Topological degree and generalized asymmetric oscillators. Zbl 1105.37036 Fonda, Alessandro 2 2006 Periodic solutions of perturbed isochronous Hamiltonian systems at resonance. Zbl 1080.34020 Fabry, Christian; Fonda, Alessandro 10 2005 Unbounded motions of perturbed isochronous Hamiltonian systems at resonance. Zbl 1088.34027 Fabry, Christian; Fonda, Alessandro 9 2005 Handbook of differential equations: Ordinary differential equations. Vol. II. Zbl 1074.34003 6 2005 Positively homogeneous Hamiltonian systems in the plane. Zbl 1068.34035 Fonda, Alessandro 18 2004 Handbook of differential equations: Ordinary differential equations. Vol. I. Zbl 1067.34001 8 2004 Asymmetric nonlinear oscillators. Zbl 0993.34037 Fabry, Christian; Fonda, Alessandro 1 2001 Bifurcations from infinity in asymmetric nonlinear oscillators. Zbl 0979.34033 Fabry, Christian; Fonda, Alessandro 3 2000 Positively homogeneous equations in the plane. Zbl 1079.34011 Fonda, Alessandro; Ortega, Rafael 3 2000 Nonlinear resonance in asymmetric oscillators. Zbl 0915.34033 Fabry, Christian; Fonda, Alessandro 33 1998 Bounded solutions of nonlinear second order ordinary differential equations. Zbl 0954.34027 Fonda, Alessandro; Zanolin, Fabio 4 1998 Periodic oscillations of forced pendulums with very small length. Zbl 0865.34033 Fonda, Alessandro; Zanolin, Fabio 7 1997 Periodic perturbations of scalar second order differential equations. Zbl 0951.34024 Buttazzoni, Paola; Fonda, Alessandro 4 1997 Periodic solutions for a conservative system of differential equations with a singularity of repulsive type. Zbl 0830.34033 Fonda, Alessandro 10 1995 Periodic oscillations for a nonlinear suspension bridge model. Zbl 0810.73030 Fonda, Alessandro; Schneider, Zdenek; Zanolin, Fabio 20 1994 Large-amplitude subharmonic oscillations for scalar second-order differential equations with asymmetric nonlinearities. Zbl 0798.34048 Fonda, A.; Ramos, M. 18 1994 Subharmonic solutions for some second-order differential equations with singularities. Zbl 0787.34035 Fonda, Alessandro; Manásevich, Raúl; Zanolin, Fabio 94 1993 Subharmonic solutions for second order differential equations. Zbl 0803.34029 Fonda, A.; Ramos, M.; Willem, M. 14 1993 Periodic solutions of scalar second order differential equations with a singularity. Zbl 1221.34110 Fonda, Alessandro 9 1993 On the existence of periodic solutions for scalar second order differential equations when only the asymptotic behaviour of the potential is known. Zbl 0782.34047 Fonda, Alessandro 9 1993 Semilinear equations at resonance with non-symmetric linear part. Zbl 0859.47041 Fabry, C.; Fonda, A.; Munyamarere, F. 3 1993 Subharmonic solutions of conservative systems with nonconvex potentials. Zbl 0752.34027 Fonda, A.; Lazer, A. C. 27 1992 On the use of time-maps for the solvability of nonlinear boundary value problems. Zbl 0766.34012 Fonda, Alessandro; Zanolin, Fabio 22 1992 Iterative and variational methods for the solvability of some semilinear equations in Hilbert spaces. Zbl 0761.34047 Fonda, Alessandro; Mawhin, Jean 11 1992 Nonlinear equations at resonance and generalized eigenvalue problems. Zbl 0756.34079 Fabry, C.; Fonda, A. 4 1992 An iterative method for the solvability of semilinear equations in Hilbert spaces and applications. Zbl 0813.47077 Fonda, A.; Mawhin, J. 4 1992 Periodic oscillations for a suspension bridge model. (Abstract). Zbl 0850.34019 Fonda, A.; Schneider, Z.; Zanolin, F. 1 1992 On a nonresonance condition for a semilinear elliptic problem. Zbl 0735.35054 Fonda, Alessandro; Gossez, Jean-Pierre; Zanolin, Fabio 4 1991 Periodic solutions of nonlinear differential equations with double resonance. Zbl 0729.34025 Fabry, C.; Fonda, A. 20 1990 Semicoercive variational problems at resonance: An abstract approach. Zbl 0727.35056 Fonda, A.; Gossez, J.-P. 6 1990 Periodic solutions of asymptotically positively homogeneous differential equations. Zbl 0692.34041 Fonda, Alessandro; Habets, Patrick 32 1989 Subharmonic oscillations of forced pendulum-type equations. Zbl 0708.34028 Fonda, A.; Willem, M. 19 1989 Quadratic forms, weighted eigenfunctions and boundary value problems for nonlinear second order ordinary differential equations. Zbl 0677.34022 Fonda, Alessandro; Mawhin, Jean 16 1989 Multiple periodic solutions of conservative systems with periodic nonlinearity. Zbl 0718.34054 Fonda, A.; Mawhin, J. 10 1989 Periodic solutions of second order ordinary differential equations. Zbl 0706.34038 Fonda, Alessandro; Lupo, Daniela 1 1989 Uniformly persistent semidynamical systems. Zbl 0667.34065 Fonda, Alessandro 49 1988 Lower semicontinuous perturbations of maximal monotone differential inclusions. Zbl 0661.47038 Colombo, Giovanni; Fonda, Alessandro; Ornelas, António 11 1988 A continuous version of Liapunov’s convexity theorem. Zbl 0647.28002 Cellina, Arrigo; Colombo, Giovanni; Fonda, Alessandro 3 1988 Guiding functions and periodic solutions to functional differential equations. Zbl 0616.34038 Fonda, Alessandro 19 1987 Periodic solutions to second order differential equations of Liénard type with jumping nonlinearities. Zbl 0625.34046 Fonda, Alessandro; Zanolin, Fabio 6 1987 Approximate selections and fixed points for upper semicontinuous maps with decomposable values. Zbl 0606.54018 Cellina, Arrigo; Colombo, Giovanni; Fonda, Alessandro 2 1986 all cited Publications top 5 cited Publications all top 5 Cited by 641 Authors 51 Fonda, Alessandro 36 Zanolin, Fabio 23 Cheng, Zhibo 21 Sfecci, Andrea 18 Lu, Shiping 18 Wang, Zaihong 15 Boscaggin, Alberto 15 Liang, Zaitao 15 Qian, Dingbian 13 Torres, Pedro José 12 Chu, Jifeng 12 Garrione, Maurizio 12 Mawhin, Jean L. 11 Li, Shengjun 11 Zhang, Meirong 10 Kong, Fanchao 10 Kornev, Sergeĭ Viktorovich 10 Toader, Rodica 10 Xin, Yun 9 Ma, Tiantian 9 Obukhovskiĭ, Valeriĭ Vladimirovich 9 Omari, Pierpaolo 9 Ortega, Rafael 8 Feltrin, Guglielmo 8 Gidoni, Paolo 8 Rebelo, Carlota 8 Yang, Xiaojing 7 Yu, Xingchen 7 Zhang, Ziheng 6 Fabry, Christian 6 Klun, Giuliano 6 Li, Xiong 6 Liao, Fangfang 6 Ma, Ruyun 6 Malík, Josef 6 O’Regan, Donal 6 Ren, Jingli 6 Yao, Shaowen 6 Zamora, Manuel 5 Gossez, Jean-Pierre 5 Margheri, Alessandro 5 Muñoz-Hernández, Eduardo 5 Obersnel, Franco 5 Wang, Shuang 4 Agarwal, Ravi P. 4 Amster, Pablo 4 Capietto, Anna 4 Dambrosio, Walter 4 Drábek, Pavel 4 Freedman, Herbert Irving 4 Ge, Weigao 4 Li, Yong 4 Liu, Bin 4 Liu, Chunlian 4 López-Gómez, Julián 4 Luo, Zhiguo 4 Nguyen Van Loi 4 Papageorgiou, Nikolaos S. 4 Staicu, Vasile 4 Tang, Chun-Lei 4 Wang, Feng 4 Yan, Ping 3 Alves, Claudianor Oliveira 3 Bartsch, Thomas J. 3 Chen, Lijuan 3 Ding, Tongren 3 Ding, Wei 3 Dondè, Tobia 3 Fernandes, M. Lourdes C. 3 Gallo, Anna Chiara 3 Girejko, Ewa 3 Godoy, José 3 Guo, Yuanzhi 3 Habets, Patrick 3 Hernández, Eduardo M. 3 Jiang, Daqing 3 Jiang, Meiyue 3 Li, Jin 3 Liu, Qihuai 3 Mozyrska, Dorota 3 Rachůnková, Irena 3 Tajčová, Gabriela 3 Tang, Xianhua 3 Timoumi, Mohsen 3 Walther, Hans-Otto 3 Wang, Zhi-Qiang 3 Wu, Yinyin 3 Wyrwas, Małgorzata 3 Xia, Chenyang 3 Yu, Jian-She 3 Zhang, Wen 2 Aizicovici, Sergiu 2 Bacaër, Nicolas 2 Berkovits, Juha 2 Buică, Adriana 2 Burra, Lakshmi 2 Cai, Liming 2 Calamai, Alessandro 2 Cao, Zhongwei 2 Carlota, Clara ...and 541 more Authors all top 5 Cited in 156 Serials 57 Journal of Differential Equations 47 Journal of Mathematical Analysis and Applications 42 Nonlinear Analysis. Theory, Methods & Applications. Series A: Theory and Methods 23 Nonlinear Analysis. Theory, Methods & Applications 20 Boundary Value Problems 17 Advances in Difference Equations 15 Nonlinear Analysis. Real World Applications 14 Journal of Fixed Point Theory and Applications 12 Journal of Dynamics and Differential Equations 12 NoDEA. Nonlinear Differential Equations and Applications 12 Advanced Nonlinear Studies 11 Discrete and Continuous Dynamical Systems 10 Applied Mathematics and Computation 9 Proceedings of the American Mathematical Society 8 Mathematical Methods in the Applied Sciences 8 Annali di Matematica Pura ed Applicata. Serie Quarta 8 Applications of Mathematics 8 Topological Methods in Nonlinear Analysis 8 Abstract and Applied Analysis 7 Communications in Contemporary Mathematics 7 Communications on Pure and Applied Analysis 6 Discrete and Continuous Dynamical Systems. Series B 6 Advances in Nonlinear Analysis 5 Rocky Mountain Journal of Mathematics 5 Applied Mathematics Letters 5 Proceedings of the Royal Society of Edinburgh. Section A. Mathematics 5 Acta Mathematica Sinica. English Series 5 AIMS Mathematics 4 Computers & Mathematics with Applications 4 Journal of Mathematical Biology 4 Nonlinearity 4 ZAMP. Zeitschrift für angewandte Mathematik und Physik 4 Monatshefte für Mathematik 4 Results in Mathematics 4 Acta Applicandae Mathematicae 4 Celestial Mechanics and Dynamical Astronomy 4 Journal of Inequalities and Applications 4 Qualitative Theory of Dynamical Systems 4 Mediterranean Journal of Mathematics 4 Discrete and Continuous Dynamical Systems. Series S 4 Open Mathematics 3 Bulletin of the Australian Mathematical Society 3 Mathematical Biosciences 3 Mathematische Nachrichten 3 Proceedings of the Edinburgh Mathematical Society. Series II 3 Transactions of the American Mathematical Society 3 Zeitschrift für Analysis und ihre Anwendungen 3 Annales de l’Institut Henri Poincaré. Analyse Non Linéaire 3 Mathematical and Computer Modelling 3 Russian Mathematics 3 Filomat 3 Discrete Dynamics in Nature and Society 3 Journal of Dynamical and Control Systems 3 Complex Variables and Elliptic Equations 3 Journal of Function Spaces 2 Applicable Analysis 2 Journal of the Franklin Institute 2 Periodica Mathematica Hungarica 2 Chaos, Solitons and Fractals 2 Applied Mathematics and Optimization 2 Archiv der Mathematik 2 Fuzzy Sets and Systems 2 Journal of Functional Analysis 2 Rendiconti del Seminario Matemàtico e Fisico di Milano 2 Ricerche di Matematica 2 Mathematical Social Sciences 2 Acta Mathematicae Applicatae Sinica. English Series 2 Automation and Remote Control 2 Journal de Mathématiques Pures et Appliquées. Neuvième Série 2 SIAM Journal on Mathematical Analysis 2 Electronic Journal of Differential Equations (EJDE) 2 Computational and Applied Mathematics 2 Georgian Mathematical Journal 2 Nonlinear Dynamics 2 The ANZIAM Journal 2 Differential Equations 2 Portugaliae Mathematica. Nova Série 2 Acta Mathematica Scientia. Series A. (Chinese Edition) 2 Bulletin of the Malaysian Mathematical Sciences Society. Second Series 2 SIAM Journal on Applied Dynamical Systems 1 Computer Physics Communications 1 Israel Journal of Mathematics 1 Journal of Mathematical Physics 1 Lithuanian Mathematical Journal 1 Theoretical and Mathematical Physics 1 Bulletin of Mathematical Biology 1 Annales Polonici Mathematici 1 Bulletin de la Société Mathématique de France 1 Commentarii Mathematici Helvetici 1 Journal of Computational and Applied Mathematics 1 Journal of Soviet Mathematics 1 Kyungpook Mathematical Journal 1 Manuscripta Mathematica 1 Mathematische Annalen 1 Mathematica Slovaca 1 Mathematische Zeitschrift 1 Numerical Functional Analysis and Optimization 1 Rendiconti del Circolo Matemàtico di Palermo. Serie II 1 Rendiconti del Seminario Matematico della Università di Padova 1 Theoretical Population Biology ...and 56 more Serials all top 5 Cited in 31 Fields 485 Ordinary differential equations (34-XX) 160 Operator theory (47-XX) 150 Dynamical systems and ergodic theory (37-XX) 77 Partial differential equations (35-XX) 52 Biology and other natural sciences (92-XX) 42 Mechanics of particles and systems (70-XX) 29 Global analysis, analysis on manifolds (58-XX) 18 Calculus of variations and optimal control; optimization (49-XX) 13 Systems theory; control (93-XX) 11 Mechanics of deformable solids (74-XX) 8 Difference and functional equations (39-XX) 6 Numerical analysis (65-XX) 6 Fluid mechanics (76-XX) 4 Real functions (26-XX) 4 Measure and integration (28-XX) 4 Integral equations (45-XX) 4 Functional analysis (46-XX) 4 General topology (54-XX) 3 Potential theory (31-XX) 3 Convex and discrete geometry (52-XX) 3 Algebraic topology (55-XX) 2 Probability theory and stochastic processes (60-XX) 2 Computer science (68-XX) 2 Optics, electromagnetic theory (78-XX) 2 Game theory, economics, finance, and other social and behavioral sciences (91-XX) 1 Linear and multilinear algebra; matrix theory (15-XX) 1 Several complex variables and analytic spaces (32-XX) 1 Approximations and expansions (41-XX) 1 Geometry (51-XX) 1 Statistical mechanics, structure of matter (82-XX) 1 Information and communication theory, circuits (94-XX) Citations by Year