We prove existence of small amplitude, 2p/v-periodic in time solutions of completely resonant nonlinear wave equations with Dirichlet boundary conditions for any frequency belonging to a Cantor-like set of positive measure and for a generic set of nonlinearities. The proof relies on a suitable Lyapunov-Schmidt decomposition and a variant of the Nash-Moser Implicit Function Theorem.
Dimostriamo l'esistenza di soluzioni di piccola ampiezza, -periodiche nel tempo, per equazioni delle onde nonlineari completamente risonanti, per frequenze in un insieme di Cantor di misura positiva e per un insieme generico di nonlinearità. La dimostrazione si basa su una opportuna decomposizione di Lyapunov-Schmidt e su una variante dei teoremi di funzione implicita alla Nash-Moser.
@article{BUMI_2004_8_7B_2_519_0, author = {Massimiliano Berti and Philippe Bolle}, title = {Bifurcation of free vibrations for completely resonant wave equations}, journal = {Bollettino dell'Unione Matematica Italiana}, volume = {7-A}, year = {2004}, pages = {519-528}, zbl = {1182.35166}, mrnumber = {2072952}, language = {en}, url = {http://dml.mathdoc.fr/item/BUMI_2004_8_7B_2_519_0} }
Berti, Massimiliano; Bolle, Philippe. Bifurcation of free vibrations for completely resonant wave equations. Bollettino dell'Unione Matematica Italiana, Tome 7-A (2004) pp. 519-528. http://gdmltest.u-ga.fr/item/BUMI_2004_8_7B_2_519_0/
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