Sharif University of Technology
Scientia Iranica
1026-3098
15
2
2008
04
01
On the Existence of Periodic Solutions for Nonlinear Ordinary Dierential Equations
2968
EN
D.
Shadman
Department of Mathematical Sciences,Sharif University of Technology
B.
Mehri
Department of Mathematics,Sharif University of Technology
Journal Article
2009
05
30
In this paper, the existence of periodic solutions of autonomous ordinary dierential equations of
a 4th and 5th order is investigated. The method used is based on the Brower's degree theorem
using the homotopy invariant a property of a topological degree.
http://scientiairanica.sharif.edu/article_2968_5bf491d857998bca0df14c1b94098d1b.pdf