Periodicity in a Delayed Ratio-Dependent
✍
Meng Fan; Ke Wang
📂
Article
📅
2001
🏛
Elsevier Science
🌐
English
⚖ 96 KB
With the help of a continuation theorem based on Gaines and Mawhin's coincidence degree, easily verifiable criteria are established for the global existence of positive periodic solutions of a delayed ratio-dependent predator-prey system in a periodic environment.