Random growth in a tessellation

Source abstract

Let S be n dimensional Euclidean space and let T be a division of S into cells. Assume that each cell must be either white or black at any time t . At time 0 the cell at the origin, α 0 , is black and all other cells are white. Let G be some stochastic growth process which tends to change white cells with black neighbours into black cells. Let C(t) be the black shape at time t . For a family, F , of such growth processes we prove the following theorem.