... subdisciplines of physics and engineering, the content and the level of math- ematical formalism has to be chosen very carefully. Recently the growing in- terest in interdisciplinary studies ... motion and the Fokker-Planck equation. This is an emerging field with enormous potential and with applications to physics, chemistry, biology, engineering, and finance. For beginning researchers ... and for meticulously reading Chapters 1 and 9 with 14 and 20. I also thank Prof. N. K. Pak for many interesting and stimulating discussions, encouragement, and critical reading...