Abstract

The problem of necessary conditions for the existence of periodical solutions of the system $X'=\f(t)P(X)+Q(t)$ is considered, where $\f(t)$, $Q_i(t)$ ($i=1,\dots,n$) are continuous functions belonging to certain classes.

Keywords: Periodical solution, differential system.

MSC: 34C25

Pages:  15--17     

Volume  57 ,  Issue  1$-$2 ,  2005