Topic
speed of light.
in cellular automata, a propagation rate across the grid of exactly one step (either horizontally, vertically or diagonally) per generation
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About speed of light
In Conway's Game of Life, the speed of light is a propagation rate across the grid of exactly one step per generation. In a single generation, a cell can only influence its nearest neighbours, and so the speed of light is the maximum rate at which information can propagate. It is therefore an upper bound to the speed at which any pattern can move.
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