Opuscula Mathematica

Applying the Poincaré-Birkhoff theorem to antiperiodic problems

Alessandro Fonda
Natnael Gezahegn Mamo
Andrea Sfecci
Wahid Ullah

Abstract. We show how the Poincaré-Birkhoff theorem for Hamiltonian systems can be used to find multiple solutions of the antiperiodic problem. Applications are given to scalar second order differential equations whose nonlinearities provide a twist in the phase plane, among which those with a superlinear or sublinear behaviour at infinity.

Keywords: antiperiodic solutions, Poincaré-Birkhoff theorem, Hamiltonian systems.

Mathematics Subject Classification: 34B15.

Full text (pdf)

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  • Alessandro Fonda (corresponding author)
  • ORCID iD https://orcid.org/0000-0001-6230-3101
  • Dipartimento di Matematica, Informatica e Geoscienze, Università degli Studi di Trieste, P.le Europa 1, 34127 Trieste, Italy
  • Natnael Gezahegn Mamo
  • ORCID iD https://orcid.org/0000-0002-3765-103X
  • Dipartimento di Matematica, Informatica e Geoscienze, Università degli Studi di Trieste, P.le Europa 1, 34127 Trieste, Italy
  • Communicated by Marek Galewski.
  • Received: 2025-11-18.
  • Revised: 2026-01-08.
  • Accepted: 2026-01-08.
  • Published online: 2026-03-18.
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