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 p...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.展开更多
In this paper, we give some theorems on existence of periodic solutions for a class of nonlinear differential equations. A concise expression about the bounds of time-delay is obtained, these theorems include some wel...In this paper, we give some theorems on existence of periodic solutions for a class of nonlinear differential equations. A concise expression about the bounds of time-delay is obtained, these theorems include some well-known results as their special cases.展开更多
文摘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.
文摘In this paper, we give some theorems on existence of periodic solutions for a class of nonlinear differential equations. A concise expression about the bounds of time-delay is obtained, these theorems include some well-known results as their special cases.
