Browsing by Subject "Krasnoselskii"

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On the existence of positive periodic solutions for totally nonlinear neutral differential equations of the second-order with functional delay

Essel, Emmanuel K.; Yankson, Ernest (University of Cape Coast, 2014)

We prove that the totally nonlinear second-order neutral diferential equation dt2x(t) + p(t)ddtx(t) + q(t)h(x(t)) =ddtc(t, x(t − τ (t))) + f(t, ρ(x(t)), g(x(t − τ (t)))) has positive periodic solutions by employing the ...
Positive periodic solutions for neutral functional differential systems

Yankson, Ernest (University of Cape Coast, 2015)

We study the existence of positive periodic solutions of a system of neutral diferential equations. In the process we construct two mappings in which one is a contraction and the other compact. A Krasnoselskii’s fixed point ...
Positive periodic solutions in neutral delay difference equations

Raffoul, Youssef N.; Yankson, Ernest (University of Cape Coast, 2010)

We use Krasnoselskii’s fxed oint theorem to obtain suffcient conditions for the existence of a positive periodic solution of the neutral delay difference equation x(n + 1) = a(n)x(n) + c∆x(n − τ ) + g(n, x(n − τ ))

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