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Publication:3768046
zbMath0631.58012MaRDI QIDQ3768046
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Publication date: 1987
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periodic solutionswinding numberforced oscillationsequilibrium pointPoincaré-Birkhoff fixed point theorem
Periodic solutions to PDEs (35B10) Forced motions for nonlinear problems in mechanics (70K40) Characteristic classes and numbers in differential topology (57R20) Local and nonlocal bifurcation theory for dynamical systems (37G99) Fixed points and periodic points of finite-dimensional Hamiltonian and Lagrangian systems (37J12)
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