TY  - GEN 
AU  - Fonda, Alessandro
AU  - Garzón, Manuel
AU  - Sfecci, Andrea
PY  - 2023
UR  - https://hdl.handle.net/10481/84226
AB  - In 1983, Conley and Zehnder proved a remarkable theorem on the periodic problem associated with a general Hamiltonian system, giving a partial answer to a conjecture by Arnold. Their pioneering paper has been extended in different directions by...
LA  - eng
PB  - Elsevier
KW  - Hamiltonian systems
KW  - Periodic boundary value problem
KW  - Poincaré–Birkhoff theorem
KW  - Lower and upper solutions
TI  - An extension of the Poincaré–Birkhoff Theorem coupling twist with lower and upper solutions
DO  - 10.1016/j.jmaa.2023.127599
ER  -