Readily verifiable conditions under which a dynamical system of the form (x
) over dot = f(x) possesses an unbounded solution are presented. The result
s are illustrated by showing they can be used to infer results about lack o
f global stabilizability for nonlinear control systems. The key observation
in the paper is that behaviour at infinity can be studied using local meth
ods applied to an auxiliary system, (C) 2001 Elsevier Science Ltd. All righ
ts reserved.