title: Diffusion at finite speed and random walks.
abstract: Diffusion, which occurs with infinite speed, results from a random walk with steps of finite speed. We resolve this paradox and derive a modified diffusion equation with finite speed.
authors.affiliation: Department of Mathematics, Stanford University, Stanford, CA 94305-2125, USA. keller@math.standford.edu
authors.forename: Joseph B
authors.initials: JB
authors.lastname: Keller