“A percolation process is the spread of a fluid through a medium under the influence of a random mechanism associated with the medium. This contrasts with a diffusion process, where the random mechanism is associated with the fluid.” (p. 790) #Hammersley #percolation #diffusion #process
Hammersley, John M., Percolation Processes: Lower Bounds for the Critical Probability, in: The Annals of Mathematical Statistics 28 (1957), 790–795.