Guglielmo Feltrin

Preprints

• A. Boscaggin, W. Dambrosio, G. Feltrin, Bifurcation of closed orbits of Hamiltonian systems with application to geodesics of the Schwarzschild metric, submitted.
• A. Boscaggin, W. Dambrosio, G. Feltrin, Periodic perturbations of central force problems and an application to a restricted 3-body problem, submitted.
• A. Boscaggin, W. Dambrosio, G. Feltrin, Prescribed energy periodic solutions of Kepler problems with relativistic corrections, submitted.
• A. Boscaggin, G. Feltrin, Multiple positive solutions for nonlinear problems with indefinite weight: an overview of Fabio Zanolin's contributions, to appear in Rendiconti del Seminario Matematico - Politecnico di Torino.
• G. Feltrin, A. Fonda, A. Sfecci,, A Poincaré–Birkhoff theorem for multivalued successor maps with applications to periodic superlinear Hamiltonian systems, submitted.

Published papers

• G. Feltrin, M. Garrione, Homoclinic and heteroclinic solutions for non-autonomous Minkowski-curvature equations, Nonlinear Anal.  239 (2024), Paper No. 113419, 21 pp.
• A. Boscaggin, G. Feltrin, F. Zanolin, Positive solutions for a Minkowski-curvature equation with indefinite weight and super-exponential nonlinearity, Commun. Contemp. Math.  25 (2023), no. 4, Paper No. 2250005, 20 pp.
• G. Feltrin, J. C. Sampedro, F. Zanolin, Periodic solutions to superlinear indefinite planar systems: a topological degree approach, J. Differential Equations  363 (2023), 546–581.
• G. Feltrin, F. Zanolin, Equilibrium points, periodic solutions and the Brouwer fixed point theorem for convex and non-convex domains, J. Fixed Point Theory Appl.  24 (2022), no. 4, Paper No. 68, 24 pp.
• G. Feltrin, E. Sovrano, A. Tellini, On the number of positive solutions to an indefinite parameter-dependent Neumann problem, Discrete Contin. Dyn. Syst.  42 (2022), no. 1, 21–71.
• A. Boscaggin, W. Dambrosio, G. Feltrin, Periodic solutions to a perturbed relativistic Kepler problem, SIAM J. Math. Anal.  53 (2021), no. 5, 5813–5834.
• A. Boscaggin, W. Dambrosio, G. Feltrin, S. Terracini, Parabolic orbits in Celestial Mechanics: a functional-analytic approach, Proc. Lond. Math. Soc.  123 (2021), no. 2, 203–230.
• G. Feltrin, F. Zanolin, Bound sets for a class of φ-Laplacian operators, J. Differential Equations  297 (2021), 508–535.
• A. Boscaggin, G. Feltrin, F. Zanolin, Uniqueness of positive solutions for boundary value problems associated with indefinite φ-Laplacian type equations, Open Math.  19 (2021), no. 1, 163–183.
• A. Boscaggin, G. Feltrin, E. Sovrano, High multiplicity and chaos for an indefinite problem arising from genetic models, Adv. Nonlinear Stud.  20 (2020), no. 3, 675–699.
• A. Boscaggin, G. Feltrin, Positive periodic solutions to an indefinite Minkowski-curvature equation, J. Differential Equations  269 (2020), no. 7, 5595–5645.
• A. Boscaggin, G. Feltrin, Pairs of positive radial solutions for a Minkowski-curvature Neumann problem with indefinite weight, Nonlinear Anal.  196 (2020), 111807, 14 pp.
• G. Feltrin, P. Gidoni, Multiplicity of clines for systems of indefinite differential equations arising from a multilocus population genetics model, Nonlinear Anal. Real World Appl.  54 (2020), 103108, 19 pp.
• G. Feltrin, E. Sovrano, F. Zanolin, Periodic solutions to parameter-dependent equations with a φ-Laplacian type operator, NoDEA Nonlinear Differential Equations Appl.  26 (2019), no. 5, Paper No. 38, 27 pp..
• G. Feltrin, E. Sovrano, An indefinite nonlinear problem in population dynamics: high multiplicity of positive solutions, Nonlinearity  31 (2018), no. 9, 4137–4161.
• G. Feltrin, Positive subharmonic solutions to superlinear ODEs with indefinite weight, Discrete Contin. Dyn. Syst. Ser. S  11 (2018), no. 2, 257–277.
• G. Feltrin, E. Sovrano, Three positive solutions to an indefinite Neumann problem: a shooting method, Nonlinear Anal.  166 (2018), 87–101.
• A. Boscaggin, G. Feltrin, F. Zanolin, Positive solutions for super-sublinear indefinite problems: high multiplicity results via coincidence degree, Trans. Amer. Math. Soc.  370 (2018), no. 2, 791–845.
• A. Boscaggin, G. Feltrin, Positive subharmonic solutions to nonlinear ODEs with indefinite weight, Commun. Contemp. Math.  20 (2018), no. 1, 1750021, 26 pp.
• G. Feltrin, F. Zanolin, An application of coincidence degree theory to cyclic feedback type systems associated with nonlinear differential operators, Topol. Methods Nonlinear Anal.  50 (2017), no. 2, 683–726.
• G. Feltrin, A note on a fixed point theorem on topological cylinders, Ann. Mat. Pura Appl.  196 (2017), no. 4, 1441–1458.
• G. Feltrin, Multiple positive solutions of a Sturm-Liouville boundary value problem with conflicting nonlinearities, Commun. Pure Appl. Anal.  16 (2017), no. 3, 1083–1102.
• G. Feltrin, F. Zanolin, Multiplicity of positive periodic solutions in the superlinear indefinite case via coincidence degree, J. Differential Equations  262 (2017), no. 8, 4255–4291.
• A. Boscaggin, G. Feltrin, F. Zanolin, Pairs of positive periodic solutions of nonlinear ODEs with indefinite weight: a topological degree approach for the super-sublinear case, Proc. Roy. Soc. Edinburgh Sect. A  146 (2016), no. 3, 449–474.
• G. Feltrin, Existence of positive solutions of a superlinear boundary value problem with indefinite weight, Discrete Contin. Dyn. Syst. 2015, Dynamical systems, differential equations and applications. 10th AIMS Conference. Suppl.  436-445.
• G. Feltrin, F. Zanolin, Existence of positive solutions in the superlinear case via coincidence degree: the Neumann and the periodic boundary value problems, Adv. Differential Equations  20 (2015), no. 9-10, 937–982.
• G. Feltrin, F. Zanolin, Multiple positive solutions for a superlinear problem: a topological approach, J. Differential Equations  259 (2015), no. 3, 925–963.

Books

• G. Feltrin, Positive solutions to indefinite problems: a topological approach, Frontiers in Mathematics, Birkhäuser/Springer,  Cham, 2018, xxviii+304 pp.

Theses

• G. Feltrin, Positive solutions to indefinite problems: a topological approach, Ph.D. thesis, SISSA (International School for Advanced Studies), Supervisor: Prof. Fabio Zanolin.
• G. Feltrin, Fixed point index, Krasnosel'skii theorems and existence of positive, Master thesis, University of Udine, Advisor: Prof. Fabio Zanolin.
• G. Feltrin, The mathematical foundations of the electromagnetic theory, Bachelor thesis, University of Udine, Advisor: Dr. Stefano Ansoldi.

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