It’s not the quantum hall effect, but fractional differential operators can model ‘anomalous’ types of this process. Wick-rotating QFTs can give dynamical field theories named for this process with ‘birth’ and ‘death’ terms. The Green-Kubo relation gives a parameter for this process as the time integral of the velocity correlator. Differences in that parameter between species can cause pattern-forming instabilities in systems named for ‘reaction’ and this process which were discovered by (*) Turing. The Einstein-Schmolukowsi (10[1])relation (-5[1])states this process’ coefficient (10[1])is proportional to temperature times mobility. The Fokker-Planck equation describes drift and this process, which arises from Brownian motion. This process’s length scale is proportional to ‘square root of time’. For 10 points, name this process described by Fick’s laws, where particles (10[1])move along a concentration gradient. ■END■