Day & Night

From Biocrawler, the free encyclopedia.

Day & Night is a cellular automaton related to the Game of Life, invented by Nathan Thompson in 1997. Its rule notation is 34678/3678. The rule is given the name "Day & Night" because the ON and OFF states are symmetric: if all the cells in the Universe are inverted, the future states are the inversions of the future states of the original pattern. A pattern in which the entire universe consists of OFF cells except for finitely many ON cells can equivalently be represented by a pattern in which the whole universe is covered in ON cells except for finitely many OFF cells.

External links

• Day & Night - An Interesting Variant of Life (http://www.tip.net.au/~dbell/articles/DayNight.zip) (zip file)

Wikipedia (http://en.wikipedia.org/wiki/Main_Page) Day_&_Night (http://en.wikipedia.org/wiki/Day_&_Night) version history (http://en.wikipedia.org/w/index.php?title=Day_&_Night&action=history) GNU Free Documentation Lizenz (http://en.wikipedia.org/wiki/Wikipedia:Text_of_the_GNU_Free_Documentation_License) CC-by-sa (http://creativecommons.org/licenses/by-sa/2.5/)

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