Positive Periodic Solutions of Nonlinear First-order Functional Difference Equations with a Parameter
نویسنده
چکیده
We obtain the existence and multiplicity of positive T -periodic solutions for the difference equations ∆x(n) = a(n, x(n))− λb(n)f(x(n− τ(n))) and ∆x(n) + a(n, x(n)) = λb(n)f(x(n− τ(n))), where f(·) may be singular at x = 0. Using a fixed point theorem in cones, we extend recent results in the literature.
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تاریخ انتشار 2011