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Stochastic processes are important in non-equilibrium statistical mechanics and disordered solids.
In a time-dependent stochastic process, a variable that changes with time does so in such a way that there is no correlation between different time intervals. An example of a stochastic process if Brownian movement. Equations, such as the Langevin equation and the Fokker-Planck equation, that describe stochastic processes are called stochastic equations. It is necessary to use statistical methods and the theory of probability to analyse stochastic processes and their equations. They offer to buy or sell new and used college textbooks.