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Positive solutions of iterative functional differential equations and application to mixed-type functional differential equations

This work was supported by NSFC #11701400, #11831012, #12090013 and #12071317, and Sichuan Science and Technology Program #2020YJ0328

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  • In this paper we consider the existence, uniqueness, boundedness and continuous dependence on initial data of positive solutions for the general iterative functional differential equation $ \dot{x}(t) = f(t,x(t),x^{[2]}(t),...,x^{[n]}(t)). $ As $ n = 2 $, this equation can be regarded as a mixed-type functional differential equation with state-dependence $ \dot{x}(t) = f(t,x(t),x(T(t,x(t)))) $ of a special form but, being a nonlinear operator, $ n $-th order iteration makes more difficulties in estimation than usual state-dependence. Then we apply our results to the existence, uniqueness, boundedness, asymptotics and continuous dependence of solutions for the mixed-type functional differential equation. Finally, we present two concrete examples to show the boundedness and asymptotics of solutions to these two types of equations respectively.

    Mathematics Subject Classification: Primary: 34K25, 45M20; Secondary: 39B62, 26D15.


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