Applied Mathematics and Mechanics (English Edition) ›› 1994, Vol. 15 ›› Issue (1): 49-59.
赵杰民, 黄克累, 陆启韶
Zhao Jie-min, Huang Ke-lei, Lu Qi-shao
摘要: In this paper. four sufficiency theorems of existence of periodic solutions for aclass of retarded functional differential equations are given. The result of thesetheorems is better than the well-known Yoshizawa's periodic solution theorem. Anexample of application is given at the end.