Alessandro Fonda

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All published works

Action	Title	Year	Authors
+	Perturbed positively-(p, q)-homogeneous Hamiltonian systems with Frederickson–Lazer conditions	2025	Alessandro Fonda Natnael Gezahegn Mamo Andrea Sfecci Wahid Ullah
+ PDF Chat	A Poincaré–Birkhoff theorem for multivalued successor maps with applications to periodic superlinear Hamiltonian systems	2024	Guglielmo Feltrin Alessandro Fonda Andrea Sfecci
+ PDF Chat	An extension of the Poincaré–Birkhoff Theorem to systems involving Landesman–Lazer conditions	2024	Alessandro Fonda Natnael Gezahegn Mamo Andrea Sfecci
+ PDF Chat	Boundary value problems associated with Hamiltonian systems coupled with positively-(p, q)-homogeneous systems	2024	Alessandro Fonda Wahid Ullah
+ PDF Chat	Multiplicity results for Hamiltonian systems with Neumann-type boundary conditions	2024	Alessandro Fonda Natnael Gezahegn Mamo Franco Obersnel Andrea Sfecci
+	Periodic Solutions of Hamiltonian Systems with Symmetries	2024	Alessandro Fonda
+	Periodic solutions of Hamiltonian systems coupling twist with an isochronous center	2023	Alessandro Fonda Wahid Ullah
+	Periodic solutions of Hamiltonian systems coupling twist with generalized lower/upper solutions	2023	Alessandro Fonda Wahid Ullah
+	Periodic solutions of discontinuous second order differential equations. The porpoising effect	2023	Alessandro Fonda Pedro J. Torres
+ PDF Chat	A two-point boundary value problem associated with Hamiltonian systems on a cylinder	2023	Alessandro Fonda Rafael Ortega
+ PDF Chat	A Lower/Upper Solutions Result for Generalised Radial p-Laplacian Boundary Value Problems	2023	Alessandro Fonda Natnael Gezahegn Mamo Franco Obersnel Andrea Sfecci
+ PDF Chat	On Dini derivatives of real functions	2023	Alessandro Fonda Giuliano Klun Andrea Sfecci
+	A Modern Introduction to Mathematical Analysis	2023	Alessandro Fonda
+	Numerical Series and Series of Functions	2022	Alessandro Fonda
+	Exponential and Circular Functions	2022	Alessandro Fonda
+ PDF Chat	On the Dirichlet problem associated with bounded perturbations of positively-(p, q)- homogeneous Hamiltonian systems	2022	Alessandro Fonda Giuliano Klun Franco Obersnel Andrea Sfecci
+	Two-point boundary value problems for planar systems: A lower and upper solutions approach	2021	Alessandro Fonda Andrea Sfecci Rodica Toader
+ PDF Chat	Subharmonic Solutions of Weakly Coupled Hamiltonian Systems	2021	Alessandro Fonda Rodica Toader
+ PDF Chat	Periodic Solutions of Second-Order Differential Equations in Hilbert Spaces	2021	Alessandro Fonda Giuliano Klun Andrea Sfecci
+ PDF Chat	Non-well-ordered lower and upper solutions for semilinear systems of PDEs	2021	Alessandro Fonda Giuliano Klun Andrea Sfecci
+ PDF Chat	A systematic approach to nonresonance conditions for periodically forced planar Hamiltonian systems	2021	Christian Fabry Alessandro Fonda
+ PDF Chat	Well-Ordered and Non-Well-Ordered Lower and Upper Solutions for Periodic Planar Systems	2021	Alessandro Fonda Giuliano Klun Andrea Sfecci
+ PDF Chat	A dynamical approach to lower and upper solutions for planar systems "To the memory of Massimo Tarallo"	2021	Alessandro Fonda Rodica Toader
+ PDF Chat	An infinite-dimensional version of the Poincaré-Birkhoff theorem on the Hilbert cube	2020	Alberto Boscaggin Alessandro Fonda Maurizio Garrione
+ PDF Chat	Periodic solutions of nearly integrable Hamiltonian systems bifurcating from infinite-dimensional tori	2019	Alessandro Fonda Giuliano Klun Andrea Sfecci
+ PDF Chat	On the topological degree of planar maps avoiding normal cones	2019	Alessandro Fonda Giuliano Klun
+ PDF Chat	A generalization of the parallelogram law to higher dimensions	2019	Alessandro Fonda
+	A Poincaré–Birkhoff theorem for Hamiltonian flows on nonconvex domains	2018	Alessandro Fonda Antonio J. Ureña
+	The Kurzweil-Henstock Integral for Undergraduates: A Promenade Along the Marvelous Theory of Integration	2018	Alessandro Fonda
+ PDF Chat	Generalizing the Lusternik-Schnirelmann critical point theorem	2018	Alessandro Fonda
+	Playing Around Resonance: An Invitation to the Search of Periodic Solutions for Second Order Ordinary Differential Equations	2018	Alessandro Fonda
+ PDF Chat	Periodic perturbations with rotational symmetry of planar systems driven by a central force	2018	Alessandro Fonda Anna Chiara Gallo
+	A Poincaré-Birkhoff theorem for Hamiltonian flows on nonconvex domains	2018	Alessandro Fonda Antonio J. Ureña
+	Functions of Several Real Variables	2018	Alessandro Fonda
+	Differential Forms	2018	Alessandro Fonda
+ PDF Chat	Subharmonic solutions of Hamiltonian systems displaying some kind of sublinear growth	2017	Alessandro Fonda Rodica Toader
+	Radial periodic perturbations of the Kepler problem	2017	Alessandro Fonda Anna Chiara Gallo
+ PDF Chat	Multiple periodic solutions of Hamiltonian systems confined in a box	2016	Alessandro Fonda Andrea Sfecci
+ PDF Chat	On a singular periodic Ambrosetti–Prodi problem	2016	Alessandro Fonda Andrea Sfecci
+	An avoiding cones condition for the Poincaré–Birkhoff Theorem	2016	Alessandro Fonda Paolo Gidoni
+	A higher dimensional Poincaré–Birkhoff theorem for Hamiltonian flows	2016	Alessandro Fonda Antonio J. Ureña
+ PDF Chat	Periodic perturbations of Hamiltonian systems	2016	Alessandro Fonda Maurizio Garrione Paolo Gidoni
+	Lusternik–Schnirelmann Theory	2016	Alessandro Fonda
+	Preliminaries on Hilbert Spaces	2016	Alessandro Fonda
+	The Variational Method	2016	Alessandro Fonda
+	The Poincaré–Birkhoff Theorem	2016	Alessandro Fonda
+	At Resonance, Again	2016	Alessandro Fonda
+	Nonresonance and Topological Degree	2016	Alessandro Fonda
+	Operators in Hilbert Spaces	2016	Alessandro Fonda
+	Playing Around Resonance	2016	Alessandro Fonda
+	The Semilinear Problem	2016	Alessandro Fonda
+	A Myriad of Periodic Solutions	2016	Alessandro Fonda
+	The Topological Degree	2016	Alessandro Fonda
+	Playing Around Resonance	2016	Alessandro Fonda
+	Periodic solutions of weakly coupled superlinear systems	2015	Alessandro Fonda Andrea Sfecci
+ PDF Chat	Generalizing the Poincaré–Miranda theorem: the avoiding cones condition	2015	Alessandro Fonda Paolo Gidoni
+ PDF Chat	Existence and uniqueness of solutions for semilinear equations involving anti-selfadjoint operators	2014	Alessandro Fonda
+	On a Geometrical Formula Involving Medians and Bimedians	2013	Alessandro Fonda
+	A permanence theorem for local dynamical systems	2013	Alessandro Fonda Paolo Gidoni
+ PDF Chat	Periodic Bouncing Solutions for Nonlinear Impact Oscillators	2013	Alessandro Fonda Andrea Sfecci
+	A permanence theorem for dynamical systems	2013	Alessandro Fonda Paolo Gidoni
+	Periodic Bouncing Solutions for	2013	Nonlinear Impact Oscillators Alessandro Fonda
+	Generalized Sturm-Liouville boundary conditions for first order differential systems in the plane	2013	Alessandro Fonda Maurizio Garrione
+	A Landesman–Lazer-type condition for asymptotically linear second-order equations with a singularity	2012	Alessandro Fonda Maurizio Garrione
+	Periodic Solutions of Pendulum-Like Hamiltonian Systems in the Plane	2012	Alessandro Fonda Rodica Toader
+	Periodic solutions of perturbed Hamiltonian systems in the plane by the use of the Poincaré-Birkhoff theorem	2012	Alessandro Fonda Marco Sabatini Fabio Zanolin
+ PDF Chat	A multiplicity result for periodic solutions of second order differential equations with a singularity	2011	Alberto Boscaggin Alessandro Fonda Maurizio Garrione
+	Periodic Orbits of Radially Symmetric Systems with a Singularity: the Repulsive Case	2011	Alessandro Fonda Rodica Toader
+	A general method for the existence of periodic solutions of differential systems in the plane	2011	Alessandro Fonda Andrea Sfecci
+ PDF Chat	Periodic solutions of radially symmetric perturbations of Newtonian systems	2011	Alessandro Fonda Rodica Toader
+	Nonlinear Resonance: a Comparison Between Landesman-Lazer and Ahmad-Lazer-Paul Conditions	2011	Alessandro Fonda Maurizio Garrione
+	Lower and upper solutions to semilinear boundary value problems: an abstract approach	2011	Alessandro Fonda Rodica Toader
+ PDF Chat	Periodic solutions of singular radially symmetric systems with superlinear growth	2010	Alessandro Fonda Rodica Toader Fabio Zanolin
+	Radially symmetric systems with a singularity and asymptotically linear growth	2010	Alessandro Fonda Rodica Toader
+ PDF Chat	Periodic, subharmonic, and quasi-periodic oscillations under the action of a central force	2010	Alessandro Fonda Antonio J. Ureña
+	Double resonance with Landesman–Lazer conditions for planar systems of ordinary differential equations	2010	Alessandro Fonda Maurizio Garrione
+	Multiple periodic solutions of Hamiltonian systems in the plane	2010	Alessandro Fonda Luca Ghirardelli
+	Multiple periodic solutions of scalar second order differential equations	2010	Alessandro Fonda Luca Ghirardelli
+ PDF Chat	Nonlinear perturbations of some non-invertible differential operators	2009	Alessandro Fonda Rodica Toader
+	Periodic orbits of radially symmetric Keplerian-like systems: A topological degree approach	2008	Alessandro Fonda Rodica Toader
+ PDF Chat	Planar differential systems at resonance	2006	Alessandro Fonda Jean Mawhin
+ PDF Chat	Unbounded Motions of Perturbed Isochronous Hamiltonian Systems at Resonance	2005	Christian Fabry Alessandro Fonda
+	Periodic solutions of perturbed isochronous hamiltonian systems at resonance	2005	Christian Fabry Alessandro Fonda
+	Positively homogeneous hamiltonian systems in the plane	2004	Alessandro Fonda
+	Multiple solutions of positively homogeneous equations	2002	Alessandro Fonda Pedro J. Torres
+	Multiple solutions ofpositively homogeneous equations	2002	Alessandro Fonda Pedro J. Torres
+	Multiplicidad de soluciones en un sistema positivamente homogéneo	2001	Alessandro Fonda Pedro José Torres Villarroya
+	Asymmetric Nonlinear Oscillators	2001	Christian Fabry Alessandro Fonda
+ PDF Chat	Positively homogeneous equations in the plane	2000	Alessandro Fonda Rafael Ortega
+ PDF Chat	Bounded solutions of nonlinear second order ordinary differential equations	1998	Alessandro Fonda Fabio Zanolin
+	Periodic perturbations of scalar second order differential equations	1997	Paola Buttazzoni Alessandro Fonda
+	Periodic oscillations of forced pendulums with very small length	1997	Alessandro Fonda Fabio Zanolin
+	Periodic solutions for a conservative system of differential equations with a singularity of repulsive type	1995	Alessandro Fonda
+	Periodic oscillations for a nonlinear suspension bridge model	1994	Alessandro Fonda Zdenek Schneider Fabio Zanolin
+	Large-Amplitude Subharmonic Oscillations for Scalar Second-Order Differential Equations with Asymmetric Nonlinearities	1994	Alessandro Fonda Miguel Ramos
+	Semilinear Equations at Resonance with Non-symmetric Linear Part	1993	C. Fabry Alessandro Fonda F. Munyamarere
+ PDF Chat	On the Existence of Periodic Solutions for Scalar Second Order Differential Equations when only the Asymptotic Behaviour of the Potential is Known	1993	Alessandro Fonda
+	Subharmonic Solutions for Some Second-Order Differential Equations with Singularities	1993	Alessandro Fonda Raúl Manásevich Fabio Zanolin
+ PDF Chat	Subharmonic solutions for second order differential equations	1993	Alessandro Fonda Miguel Ramos Michael Willem
+ PDF Chat	On the existence of periodic solutions for scalar second order differential equations when only the asymptotic behaviour of the potential is known	1993	Alessandro Fonda
+	CRITICAL POINT THEORY AND MULTIPLE PERIODIC SOLUTIONS OF CONSERVATIVE SYSTEMS WITH PERIODIC NONLINEARITY	1992	Alessandro Fonda Jean Mawhin
+	On the use of time-maps for the solvability of nonlinear boundary value problems	1992	Alessandro Fonda Fabio Zanolin
+	Iterative and variational methods for the solvability of some semilinear equations in Hilbert spaces	1992	Alessandro Fonda Jean Mawhin
+	Nonlinear equations at resonance and generalized eigenvalue problems	1992	C. Fabry Alessandro Fonda
+ PDF Chat	Subharmonic solutions of conservative systems with nonconvex potentials	1992	Alessandro Fonda A. C. Lazer
+ PDF Chat	On a nonresonance condition for a semilinear elliptic problem	1991	Alessandro Fonda Jean–Pierre Gossez Fabio Zanolin
+ PDF Chat	Periodic solutions of nonlinear differential equations with double resonance	1990	C. Fabry Alessandro Fonda
+	Subharmonic oscillations of forced pendulum-type equations	1989	Alessandro Fonda Michel Willem
+	Periodic solutions of asymptotically positively homogeneous differential equations	1989	Alessandro Fonda Patrick Habets
+	Quadratic forms, weighted eigenfunctions and boundary value problems for non-linear second order ordinary differential equations	1989	Alessandro Fonda Jean Mawhin
+ PDF Chat	Uniformly Persistent Semidynamical Systems	1988	Alessandro Fonda
+	Lower semicontinuous perturbations of maximal monotone differential inclusions	1988	Giovanni Colombo Alessandro Fonda António Ornelas
+ PDF Chat	A continuous version of Liapunov’s convexity theorem	1988	Giovanni Colombo Alessandro Fonda Arrigo Cellina
+ PDF Chat	Uniformly persistent semidynamical systems	1988	Alessandro Fonda
+	Semicoercive variational problems at resonance	1988	Jean–Pierre Gossez Alessandro Fonda
+ PDF Chat	Guiding functions and periodic solutions to functional-differential equations	1987	Alessandro Fonda
+	Periodic solutions to second order differential equations of Liénard type with jumping nonlinearities	1987	Alessandro Fonda Fabio Zanolin
+	Guiding Functions and Periodic Solutions to Functional Differential Equations	1987	Alessandro Fonda
+ PDF Chat	Approximate Selections and Fixed Points for Upper Semicontinuous Maps with Decomposable Values	1986	Arrigo Cellina Giovanni Colombo Alessandro Fonda
+ PDF Chat	Approximate selections and fixed points for upper semicontinuous maps with decomposable values	1986	Arrigo Cellina Giovanni Colombo Alessandro Fonda

Common Coauthors

Coauthor	Papers Together
Andrea Sfecci	17
Rodica Toader	12
Fabio Zanolin	9
Maurizio Garrione	7
Giuliano Klun	7
Paolo Gidoni	5
Wahid Ullah	4
Christian Fabry	4
Giovanni Colombo	4
Jean Mawhin	4
Antonio J. Ureña	4
Natnael Gezahegn Mamo	3
Franco Obersnel	3
Arrigo Cellina	3
Pedro J. Torres	3
C. Fabry	3
Jean–Pierre Gossez	2
Rafael Ortega	2
Anna Chiara Gallo	2
Luca Ghirardelli	2
Alberto Boscaggin	2
Miguel Ramos	2
Zdenek Schneider	1
Marco Sabatini	1
A. C. Lazer	1
Guglielmo Feltrin	1
Raúl Manásevich	1
Natnael Gezahegn Mamo	1
Michel Willem	1
Nonlinear Impact Oscillators	1
Michael Willem	1
Patrick Habets	1
F. Munyamarere	1
Paola Buttazzoni	1
António Ornelas	1
Pedro José Torres Villarroya	1

Commonly Cited References

Action	Title	Year	Authors	# of times referenced
+	A higher dimensional Poincaré–Birkhoff theorem for Hamiltonian flows	2016	Alessandro Fonda Antonio J. Ureña	18
+	Solvability of Nonlinear Equations and Boundary Value Problems	1981	Svatopluk Fučík	17
+	Subharmonic Solutions for Some Second-Order Differential Equations with Singularities	1993	Alessandro Fonda Raúl Manásevich Fabio Zanolin	14
+	Two-Point Boundary Value Problems: Lower and Upper Solutions	2006	Colette De Coster Patrick Habets	13
+ PDF Chat	Boundary-value problems for weakly nonlinear ordinary differential equations	1976	E. N. Dancer	12
+	The Birkhoff-Lewis fixed point theorem and a conjecture of V.I. Arnold	1983	C. Conley Eduard Zehnder	12
+	Periodic solutions of Duffing's equations with superquadratic potential	1992	Tongren Ding Fabio Zanolin	11
+	A relative category and applications to critical point theory for strongly indefinite functionals	1990	Andrzej Szulkin	11
+	Minimax Methods in Critical Point Theory with Applications to Differential Equations	1986	P. Rabinowitz	11
+ PDF Chat	A generalization of the Poincaré-Birkhoff theorem	1983	Wei Yue Ding	10
+	On the periodic nonlinearity and the multiplicity of solutions	1989	Kung-Ching Chang	10
+	Topological Degree Methods in Nonlinear Boundary Value Problems	1979	Jean Mawhin	10
+	Landesman-Lazer Conditions for Periodic Boundary Value Problems with Asymmetric Nonlinearities	1995	C. Fabry	10
+ PDF Chat	On periodic solutions of nonlinear differential equations with singularities	1987	A. C. Lazer Sergio Solimini	10
+	Periodic solutions of perturbed Hamiltonian systems in the plane by the use of the Poincaré-Birkhoff theorem	2012	Alessandro Fonda Marco Sabatini Fabio Zanolin	10
+ PDF Chat	Partial Differential Equations	1988	Shiing-Shen Chern	10
+	Sur un théorème de géométrie	1912	Henri Poincaré	10
+	A generalized saddle point theorem	1989	J.Q Liu	10
+	Multiple solutions of the periodic boundary value problem for some forced pendulum-type equations	1984	Jean Mawhin Michel Willem	10
+	On the number of 2π periodic solutions for u″ + g(u) = s(1 + h(t)) using the Poincaré-Birkhoff theorem	1992	Manuel del Pino Raúl Manásevich Alejandro Murua	9
+	Periodic solutions of x′' + f(x, t) = 0 via the Poincaré-Birkhoff theorem	1976	Howard Jacobowitz	9
+	Periodic solutions of weakly coupled superlinear systems	2015	Alessandro Fonda Andrea Sfecci	9
+	Positively homogeneous hamiltonian systems in the plane	2004	Alessandro Fonda	9
+ PDF Chat	Periodic solutions of radially symmetric perturbations of Newtonian systems	2011	Alessandro Fonda Rodica Toader	9
+	Periodic solutions of some forced Liénard differential equations at resonance	1983	Jean Mawhin James Ward	9
+	Generalizations of the Poincare-Birkhoff Theorem	1988	John Franks	9
+	Periodic orbits of radially symmetric Keplerian-like systems: A topological degree approach	2008	Alessandro Fonda Rodica Toader	8
+ PDF Chat	Coincidence Degree, and Nonlinear Differential Equations	1977	Robert E. Gaines Jean Mawhin	8
+	II problema dei valori ai limiti studiato in grande per le equazioni differenziali del secondo ordine	1931	Giuseppe Scorza Dragoni	8
+	Coincidence degree and nonlinear differential equations	1977	Robert E. Gaines Jean Mawhin	8
+	A note on the Poincaré—Birkhoff fixed point theorem and periodic solutions of planar systems	1997	Carlota Rebelo	8
+ PDF Chat	Periodic perturbations of Hamiltonian systems	2016	Alessandro Fonda Maurizio Garrione Paolo Gidoni	8
+	On boundary value problems for superlinear second order differential equations	1977	Philip Hartman	8
+	Periodic Solutions of Pendulum-Like Hamiltonian Systems in the Plane	2012	Alessandro Fonda Rodica Toader	7
+ PDF Chat	Periodic, subharmonic, and quasi-periodic oscillations under the action of a central force	2010	Alessandro Fonda Antonio J. Ureña	7
+ PDF Chat	Periodic solutions of nonlinear differential equations with double resonance	1990	C. Fabry Alessandro Fonda	7
+ PDF Chat	Multiplicity results for periodic solutions of second order ODEs with asymmetric nonlinearities	1996	Carlota Rebelo Fabio Zanolin	7
+	Limit Relative Category and Critical Point Theory	1994	G. Fournier Daniela Lupo Miguel Ramos Michel Willem	7
+ PDF Chat	Well-Ordered and Non-Well-Ordered Lower and Upper Solutions for Periodic Planar Systems	2021	Alessandro Fonda Giuliano Klun Andrea Sfecci	7
+ PDF Chat	Proof of the Poincaré-Birkhoff fixed point theorem.	1977	Marc B. Brown Walter D. Neumann	7
+	Subharmonic solutions of second order nonlinear equations: a time-map approach	1993	Tongren Ding Fablo Zanolin	7
+ PDF Chat	Monotone twist maps and periodic solutions of systems of Duffing type	2014	Alberto Boscaggin Rafael Ortega	7
+	On the use of time-maps for the solvability of nonlinear boundary value problems	1992	Alessandro Fonda Fabio Zanolin	7
+	Periodic solutions of second order differential equations with superlinear asymmetric nonlinearities	1993	C. Fabry Patrick Habets	6
+	<i>T</i>-periodic solutions for some second order differential equations with singularities	1992	Manuel del Pino Raúl Manásevich Alberto Montero	6
+	Multiple periodic solutions of second order equations with asymmetric nonlinearities	1997	Carlota Rebelo	6
+ PDF Chat	Generalizing the Poincaré–Miranda theorem: the avoiding cones condition	2015	Alessandro Fonda Paolo Gidoni	6
+	Roots of Unity and Unbounded Motions of an Asymmetric Oscillator	1998	José M. Alonso Rafael Ortega	6
+	Subharmonic oscillations of forced pendulum-type equations	1989	Alessandro Fonda Michel Willem	6
+	Radially symmetric systems with a singularity and asymptotically linear growth	2010	Alessandro Fonda Rodica Toader	6