The National Natural Science Foundation of China(No. 11071038);the Natural Science Foundation of Jiangsu Province(No. BK2010420)
By the iteration of the KAM, the following second- order differential equation ( Фp (x′))′ + F(x, x′, t) + ω^PФp (x′) +α│x│^l +e(x, t) =0 is studied, where Фp(S) = │S│^p-2s, p 〉 1, α〉 0...