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The post correspondence problem1

Published online by Cambridge University Press:  12 March 2014

Dennis F. Cudia and
Wilson E. Singletary
Dennis F. Cudia
Affiliation:
The University of WisconsinThe Pennsylvania State University
Wilson E. Singletary
Affiliation:
The University of WisconsinThe Pennsylvania State University
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Extract

The correspondence decision problem was first formulated and shown to be recursively unsolvable in Post (1946). The method of proof was to reduce the known unsolvable decision problem for the class of normal systems on a, b to the correspondence decision problem. In the present paper the concept of a standard Post normal system is used so as to obtain some equivalence reductions of combinatorial systems. In particular the following main result is obtained.

Information

Type
Research Article
Information
The Journal of Symbolic Logic , Volume 33 , Issue 3 , 10 October 1968, pp. 418 - 430
Copyright
Copyright © Association for Symbolic Logic 1968

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Footnotes

1

The Main Result of the present paper was presented to the International Congress of Mathematicians, Moscow, August 1966.

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