摘要
By means of Mawhin's continuation theorem,we study a kind of lie'nard functional differential equations:x"(t)+f(x(t))x'(t)+g(t,x(t-τ(t))) = e(t).Some new results on the existence and uniqueness of periodic solutions are obtained.
By means of Mawhin＇s continuation theorem,we study a kind of lie＇nard functional differential equations：x＂（t）＋f（x（t））x＇（t）＋g（t,x（t-τ（t））） = e（t）.Some new results on the existence and uniqueness of periodic solutions are obtained.
基金
Foundation item： Supported by the Anhui Natural Science Foundation（050460103）
Supported by the NSF of Anhui Educational Bureau（KJ2008B247）
Supported by the RSPYT of Anhui Educational Bu- reau（2008jq1111）
