Yuji Liu PERIODIC SOLUTIONS OF FIRST - ORDER FUNCTIONAL DIFFERENTIAL EQUATIONS WITH SUPPER - LINEAR NONLINEARITIES
نویسنده
چکیده
The existence results for periodic solutions concerning first-order functional differential equation x′(t) = f(t, x(t), x(t− τ1(t)), · · · , x(t− τm(t))), t ∈ R are proved. The methods are based upon the coincidence degree theory by Mawhin. The results obtained are new. Examples, that can not be solved by known theorems, are given to illustrate the main results.
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