On ordinary differential equations with quasimonotone increasing right-hand side

We prove that the initial value problem x' (t) = f (t,x (t)), \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document} $ t \in [0,T] $\end{document}, x (0) = x0, is uniquely solvable in certain ordered Banach spaces if, f is quasimonotone increasing with respect to x, and if f is satisfying a one-sided Lipschitz condition with respect to the order-inducing cone.