Reaction-diffusion processes

The main progress made in the past dozen years or more in the study of reaction-diffusion (abbrev. RD) processes is surveyed. The processes are motivated from some typical models in the modern non-equilibrium statistical physics and consist of an important class of interacting particle systems which Is currently an active research field in probability and mathematical physics. The models are concrete but as a part of the infinite-dimensional mathematics, the topic is quite hard. It is explalned how new problems arise, and how some new ideas and new mathematical tools are introduced. Surprialngly, the mathematical tools produced from the study on the simple models then turn to have a lot of powerful appllcations not only in probability theory but also in other branches of mathematics.Nevertheless,the story is still far from finished, and some important open problems are proposed for further study.