invariant tori;
semilinear Duffing equations;
boundedness of solutions;
D O I:
10.1007/BF02889506
中图分类号:
O29 [应用数学];
学科分类号:
070104 ;
摘要:
The boundedness of all the solutions for semilinear Duffing equation x" + omega(2)x + phi(x) = p(t), omega is an element of R+ \ N is proved, where p(t) is a smooth 2 pi-periodic function and the perturbation phi(x) is bounded.