Positive Periodic Solutions of Impulsive Functional Differential Equations with a Parameter
نویسندگان
چکیده
By using a fixed point theorem of strict-set-contraction, some criteria are established for the existence of positive periodic solutions of the following impulsive functional differential equations with a parameter <: ẋ(t) = −a(t)f(t, x(t))x(t) + λg(t, xt, x(t− τ(t, x(t))), t ∈ R, and t 6= tk, x(t+k )− x(t − k ) = Ik(tk, x(tk − τ(tk, x(tk)))), k ∈ Z.
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