In this process, the dynamics of the positionvector is modeled by the Langevin equation with a linear restoring force and a fluctuating diffusivity (FD).
3
If you change the location of the origin, your positionvectors will change.
4
If I take a round trip, my starting and ending positionvectors are the same thing.
5
If you know the two positionvectors, then the displacement vector would be: Finally, we are ready for the definition of average velocity.