In the present paper we investigate the number of periodic solutions of the following differential equationdydt=A 1(t)y+A 2(t)y 2+A 3(t)y 3a 0(t)+a 1(t)y+a 2(t)y 2(**)which was discussed in paper , and obtain...
In the present paper we investigate Schrodinger equationand Klein-Gordon equationand obtain a class of analytic solutions which are different from ones in [1-4] forequation (1), (2).