## On improper integrals and differential equations in ordered Banach spaces.(English)Zbl 1105.34037

This paper deals with the existence of least and greatest solutions of initial and boundary value problems in ordered Banach spaces with regular order cone. The right-hand sides of the discussed differential equations comprise locally integrable Banach-space-valued functions possessing improper integrals. Therefore, the authors study in a first section improper integrals of functions with values in such Banach spaces. Combining this with a fixed-point theorem (derived from earlier results), they prove their main result in Theorem 3.1. The problem considered in 3.1 is of a general form, so that several applications and examples can be given.

### MSC:

 34G20 Nonlinear differential equations in abstract spaces 34A99 General theory for ordinary differential equations 34B99 Boundary value problems for ordinary differential equations 34A12 Initial value problems, existence, uniqueness, continuous dependence and continuation of solutions to ordinary differential equations
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### References:

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