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Life Without Death is P-complete (1997)  (Make Corrections)  (4 citations)
David Griffeath, Cristopher Moore
COMPSYSTS: Complex Systems



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Abstract: . We show that if a cellular automaton in two or more dimensions supports growing "ladders" which can turn or block each other, then it can express arbitrary Boolean circuits. Then the problem of predicting the CA for a finite amount of time becomes P-complete, the question of whether a finite configuration grows to infinity is P-hard, and the long-term behavior of initial conditions with a periodic background is undecidable. This class includes the "Life without Death" rule, in which cells... (Update)

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...P complete. A similar technique was used by Griffeath and Moore to prove the P completeness of certain two dimensional cellular automata [29]. A simple modification of either proof shows that construction of motorcycle graphs is also Pcomplete, even when the motorcycles move...

...P complete. A similar technique was used by Griffeath and Moore to prove the P completeness of certain twodimensional cellular automata [32]. A simple modification of either proof shows that construction of motorcycle graphs is also P complete, even when the motorcycles move...

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BibTeX entry:   (Update)

D. Griffeath and C. Moore. Life Without Death is Pcomplete. Working Paper 97-05-044, Santa Fe Institute, 1997. To appear in Complex Systems. hhttp:// psoup:math:wisc:edu/java/lwodpc/lwodpc:htmli. http://citeseer.ist.psu.edu/griffeath97life.html   More

@article{ griffeath96life,
    author = "Griffeath and Moore",
    title = "Life Without Death is {P}-complete",
    journal = "COMPSYSTS: Complex Systems",
    volume = "10",
    year = "1996",
    url = "citeseer.ist.psu.edu/griffeath97life.html" }
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