- #1

- 45

- 7

## Summary:

- I can't understand the main difference and the main use why I should use this and not that and vice versa and when I should do that.

## Main Question or Discussion Point

As everyone knows that we can go from Langevin equation to Fokker-Planck equation which gives the evolution of probability density function. But what I don't understand is what is exactly the main difference between them as long as they are both give the variance (which then we can for example calculate the particle's size). I can't understand the main difference and the main use why I should use this and not that and vice versa and when I should do that.