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Diffusion Limited Aggregation
From a point on a circumference, selected at random, a particle
starts a random gaussian motion. In each step of its walk,
it is decided also at random which way goes up, down, right or
left, observes if the arrival point is occupied already by another
particle, it if does, it sticks to it, otherwise continues its
walk. If the particles goes out of the circle, disappears and
another particle is generated.
This model is used for dendrite formation, deposition in an
electrolitic solution in a central electrode and in several
physical phenomena.