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{{Noref|date=June 2009}}
'''Continuous spatial automata''', unlike [[cellular automata]], have a continuum of locations. The state of a ___location is a finite number of real numbers. Time is also continuous, and the state evolves according to differential equations. One important example is [[reaction-diffusion]] textures, differential equations proposed by [[Alan Turing]] to explain how chemical reactions could create the stripes on [[zebra]]s and spots on leopards. When these are approximated by CA, such CAs often yield similar patterns. MacLennan [http://www.cs.utk.edu/~mclennan/contin-comp.html] considers continuous spatial automata as a model of computation.
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It is an important open question whether pseudo-photons can be created in an Einstein vacuum space-time, in the same way that a [[glider gun]] in Conway's Game of Life fires off a series of gliders. If so, it is argued that pseudo-photons can be created and destroyed only in multiples of two, as a result of energy-momentum conservation.
[[Category:Cellular automata]]
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