
Summary: Existence results of periodic solutions of certain abstract, weakly nonlinear, wave equations are given when eigenvalues of linear parts of those equations are incommensurable to the time period.
resonance, Perturbations in context of PDEs, Convergence and divergence of continued fractions, problem of small divisors, Second-order nonlinear hyperbolic equations, Periodic solutions to PDEs
resonance, Perturbations in context of PDEs, Convergence and divergence of continued fractions, problem of small divisors, Second-order nonlinear hyperbolic equations, Periodic solutions to PDEs
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