# Turing Machine Enumeration: NKS versus Lexicographical

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Turing Machines (TMs) are among the simplest computational models that can perform any computational task that can be mechanized. A TM consists of an infinite tape of cells extending both to the left and right, with a head moving over these cells and performing tasks on them. Each cell has a color. The head can be in various states. Depending on the state of the head and the color of the cell under the head, the head performs its task. The task is writing a color on the cell, moving the tape either left or right, and going to a new state (possibly the same as before).

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Contributed by: Joost J. Joosten (Universidad de Sevilla, Group for Logic, Language and Information) (March 2011)

Open content licensed under CC BY-NC-SA

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"Turing Machine Enumeration: NKS versus Lexicographical"

http://demonstrations.wolfram.com/TuringMachineEnumerationNKSVersusLexicographical/

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Published: March 7 2011