- #1

Sciencestd

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- TL;DR 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.

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.