0
$\begingroup$

I wonder if the solution of scalar non-autonomous system

$\dot x(t)=F(x,t),\quad x(0)=x_0$

has a limit if $x(t)$ is uniformly bounded in time $t$.

Here $F$ is a Lipschitz function.

Can we say $x(t)$ is monotone after some point $t_*$?

  • 0
    @copper.hat I don't understand. Could you explain more details?2017-02-28
  • 0
    My apologies, I didn't read correctly, I didn't realise that it was not autonomous.2017-02-28

1 Answers 1

0

Take the system $\dot{x}(t) = \sin t$. The solution $x(t) = x(0) - (\cos t -1) $ is bounded, but $x$ is not monotonic.

  • 0
    Thank you for your answer! I am considering an equation $\dot x(t)=a(t)-b(t)x(t)$ for any bounded function $a$ and $b$ but the solution graph always seem to converge, so I asked this question.2017-02-28