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Sponsored by the Center for Science and Technology Development of the Ministry of Education
Supervised by Ministry of Education of the People's Republic of China
This paper is concerned with the existence of quasi-periodic solutions with two frequencies of completely resonant, periodically forced nonlinear beam equations subject to periodic spatial boundary conditions. We consider both the cases the forcing frequency is: (Case A) a rational number and (Case B) an irrational number. The proofs are based on the variational Lyapunov-Schmidt reduction and the linking theorem.