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| critical points (3) |
| nonlinear oscillators (3) |
| periodic solutions (3) |
| критичні точки (3) |
| нелінійні осцилятори (3) |
| періодичні розв’язки (3) |
| Hamiltonian systems (2) |
| infinite systems of differential equations (2) |
| mountain pass theorem (2) |
| travelling waves (2) |