Path-dependence in a Ramsey model with resource amenities and limited regeneration

Periodicity in a food-limited population

Periodicity in a food-limited population model with toxicants and state dependent delays

✍ Fengde Chen; Dexian Sun; Jinlin Shi 📂 Article 📅 2003 🏛 Elsevier Science 🌐 English ⚖ 192 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 foodlimited population model with toxicant and state dependent delays, that is , where r(t), k(t), a(t),