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Cellular Automata Entropy
The entropy of a list is defined by , summing over the elements of . and are the probabilities of black and white cells, respectively. The initial condition is a finite list of random bits.
The entropy can be used to study the amount of information in the evolution of a cellular automaton; it is lower in ordered systems and higher in chaotic (disordered) systems.



"Cellular Automata Entropy" from The Wolfram Demonstrations Project
 http://demonstrations.wolfram.com/CellularAutomataEntropy/
Contributed by: Daniel de Souza Carvalho
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