I'm reading notes about Liapunov stability, and in the book of Abraham, Marsden and Ratiu I found the next definition:
Let $m$ be a critical point of $X$. Then $m$ is stable (or Liapunov stable) if for any neighborhood $U$ of $m$, there is a neighborhood $V$ of $m$ such that if $m'$ $\in$ $V$, then $m'$ is $+$ complete and $F_{t}(m') \in U$ for all $t \geq 0$ .
I want to know what "$+$ complete means.
Thanks!