International Journal of Mathematics and Mathematical Sciences
Volume 2006 (2006), Article ID 38617, 16 pages
Existence of positive periodic solution of a periodic cooperative
model with delays and impulses
Department of Mathematics, Yunnan University, Kunming 650091, Yunnan, China
Received 1 December 2005; Accepted 2 May 2006
Copyright © 2006 Yongkun Li and Wenya Xing. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Sufficient conditions are obtained for the existence of at least
one positive periodic solution of a periodic cooperative model
with delays and impulses by using Mawhin's continuation theorem of
coincidence degree theory.