4.2 Article

Cantor families of periodic solutions of wave equations with C(k) nonlinearities

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Publisher

BIRKHAUSER VERLAG AG
DOI: 10.1007/s00030-007-7025-5

Keywords

nonlinear wave equation; infinite dimensional Hamiltonian systems; periodic solutions; Lyapunov-Schmidt reduction; small divisors; Nash-Moser theorem

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We prove bifurcation of Cantor families of periodic solutions for wave equations with nonlinearities of class C(k). It requires a modified Nash-Moser iteration scheme with interpolation estimates for the inverse of the linearized operators and for the composition operators.

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