Elements of the Theory of Computation
Elements of the Theory of Computation
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A Turing machine is an abstract computing device invented by Alan M. Turing in 1936. A reprint of his original paper appears in Davis (1965). A Turing machine consists of (1) a control unit, which can assume any one of a finite number of possible states; (2) a tape, marked off into discrete squares, each of which can store a single symbol taken from a finite set of possible symbols; and (3) a read-write head, which moves along the tape and transmits information to and from the control unit (see Fig. 1).