We improve some fixed point theorems by stating a fixed point result for semigroups of monotone operators in the setting of ordered Banach spaces with a normal cone. We illustrate the usefulness of our results by proving the existence and conditional unicity of a solution of an initial value problem for discontinuous nonlinear functional-differential equations under natural hypotheses involving the order structure of the underlying space.
Fixed point semitopological semigroup ordered Banach space normal cone functional-differential equation lower and upper solutions
| Primary Language | English |
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| Subjects | Mathematical Sciences |
| Journal Section | Research Article |
| Authors | |
| Publication Date | February 4, 2021 |
| Published in Issue | Year 2021 Volume: 50 Issue: 1 |