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Erschienen in:
2010 | OriginalPaper | Buchkapitel
The B36/S125 “2x2” Life-Like Cellular Automaton
verfasst von : Nathaniel Johnston
Erschienen in: Game of Life Cellular Automata
Verlag: Springer London
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The B36/S125 (or “2x2”) cellular automaton is one that takes place on a 2D square lattice much like Conway’s Game of Life. Although it exhibits high-level behaviour that is similar to Life, such as chaotic but eventually stable evolution and the existence of a natural diagonal glider, the individual objects that the rule contains generally look very different from their Life counterparts. In this article, a history of notable discoveries in the 2x2 rule is provided, and the fundamental patterns of the automaton are described. Some theoretical results are derived along the way, including a proof that the speed limits for diagonal and orthogonal spaceships in this rule are
c
/3 and
c
/2, respectively. A Margolus block cellular automaton that 2x2 emulates is investigated, and in particular a family of oscillators made up entirely of 2×2 blocks are analyzed and used to show that there exist oscillators with period 2
ℓ
(2
k
−1) for any integers
k
,
ℓ
≥1.