We apply a cone theoretic fixed point theorem and obtain conditions for the existence of positive periodic solutions of the system of functional differential equations x'(t) = A(t)x(t) + lambda f(t,x(t - tau(t)).
机构:
Univ Santiago de Compostela, Fac Matemat, Dept Estat Anal Matemat & Optimizac, Santiago De Compostela 15782, SpainUniv Lisbon, Fac Ciencias, Dept Matemat, P-1749016 Lisbon, Portugal
机构:
Guangdong Univ Business Studies, Dept Math, Guangzhou 510320, Guangdong, Peoples R ChinaGuangdong Univ Business Studies, Dept Math, Guangzhou 510320, Guangdong, Peoples R China
机构:
N China Elect Power Univ, Dept Math & Phys, Beijing 102206, Peoples R ChinaN China Elect Power Univ, Dept Math & Phys, Beijing 102206, Peoples R China