Eden patterns exist in Conway's Game of Life. Do they exist in other automata?

Harold McIntosh They exist for the great majority of cellular automata, and there is a considerable theory concerning the criteria according to which they exist or not, which in turn is related to the question of whether the automaton is reversible or not. A quick criterion is that the rule of evolution has to be "balanced" for an automaton to be reversible and thus not have Garden-of-Eden configurations. Life fails this, because many more neighborhoods lead to zeroes than to ones.

A more precise criterion is one called "mutual erasibility" introduced by Edward F. Moore, to be found in books on automata theory. This state of affairs notwithstanding, several persons have programmed a search for Life GOE's and found some; I think an example is shown in Poundstone's book.

So, of course, a Turing machine could undertake a similar calculation. As an aside, note that it is a Minsky register machine which has been shown to be a universal computer in Life, but ... more.

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