On first-order ordinary differential equations with nonnegative right-hand sides

@inproceedings{Cid2003OnFO,
  title={On first-order ordinary differential equations with nonnegative right-hand sides},
  author={Jos{\'e} {\'A}ngel Cid and Rodrigo L{\'o}pez Pouso},
  year={2003}
}
Existence of extremal solutions for scalar initial value problems is investigated. We shall concentrate upon nonlinearities having constant sign, which lead to new existence results.