Symmetry of a nonlinear diffusion equation
E. Infeld · Physical Review A · 1990
Recently interest in nonlinear diffusion processes, such as the conductivity as a simple function of concentration, has increased. However, a symmetry of an important class of relevant nonlinear diffusion equations seems to have been missed in the published literature. This symmetry can be useful in constructing new solutions, the most important example corresponding to the diffusion of a \ensuremath{\delta}-shaped pulse located at the origin at time t=0. .AE