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Langton's ant
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Langton's ant : ウィキペディア英語版
Langton's ant

Langton's ant is a two-dimensional Turing machine with a very simple set of rules but complex emergent behavior. It was invented by Chris Langton in 1986 and runs on a square lattice of black and white cells. The universality of Langton's ant was proven in 2000.〔 The idea has been generalized in several different ways, such as turmites which add more colors and more states.
==Rules==

Squares on a plane are colored variously either black or white.
We arbitrarily identify one square as the "ant". The ant can travel in any of the four cardinal directions at each step it takes. The ant moves according to the rules below:
* At a white square, turn 90° right, flip the color of the square, move forward one unit
* At a black square, turn 90° left, flip the color of the square, move forward one unit
Langton's ant can also be described as a cellular automaton, where the grid is colored black or white and the “ant” square has one of eight different colors assigned to encode the combination of black/white state and the current direction of motion of the ant.〔

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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