The Turing Machine concept defines what is meant mathematically by an algorithmic procedure. Stated another way, a function is effectively Computable Iff it can be computed by a Turing Machine.

**References**

Penrose, R. *The Emperor's New Mind: Concerning Computers, Minds, and the Laws of Physics.*
Oxford, England: Oxford University Press, pp. 47-49, 1989.

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1999-05-26