## Unbounded positive solutions and Mann iterative schemes of a second-order nonlinear neutral delay difference equation.(English)Zbl 1266.65203

Summary: This paper is concerned with the solvability of the second-order nonlinear neutral delay difference equation $$\Delta^2(x_n + a_nx_{n-\tau}) + \Delta h(n, x_{h_{1n}}, x_{h_{2n}}, \dots, x_{h_{kn}}) + f(n, x_{f_{1n}}, x_{f_{2n}}, \dots, x_{f_{kn}}) = b_n$$0 $$\forall n \geq n_0$$. Utilizing the Banach fixed point theorem and some new techniques, we show the existence of uncountably many unbounded positive solutions for the difference equation, suggest several Mann-type iterative schemes with errors, and discuss the error estimates between the unbounded positive solutions and the sequences generated by the Mann iterative schemes. Four nontrivial examples are given to illustrate the results presented in this paper.

### MSC:

 65Q10 Numerical methods for difference equations 39A12 Discrete version of topics in analysis 34K40 Neutral functional-differential equations 39A22 Growth, boundedness, comparison of solutions to difference equations
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### References:

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