e opposite direction.  We'll call fixed-points which have this property
      <em>unstable</em>.  If we look at the fixed point at $x^* = 0$, then the
      story is different: trajectories starting to the right or to the left will
      move back towards the fixed point.  We will call this fixed point
      <em>locally stable</em>.  More specifically, we'll distinguish between
      multiple types of stability (where $\epsilon$ is used to denote an arbitrary <em>small</em> scalar quantity):

      <ul>

  