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Decision problems for multiple successor arithmetics1

Published online by Cambridge University Press:  12 March 2014

J. W. Thatcher*
Affiliation:
Ibm Watson Research Center Yorktown Heights, New York

Extract

Let Nk denote the set of words over the alphabet Σk = {1, …, k}. Nk contains the null word which is denoted λ. We consider decision problems for various first-order interpreted predicate languages in which the variables range over Nk (k ≧ 2). Our main result is that there is no decision procedure for truth in the interpreted language which has the subword relation as its only non-logical primitive. This, together with known results summarized in Section 4, settles the decision problem for any language constructed on the basis of the relations and functions listed below.

Information

Type
Research Article
Copyright
Copyright © Association for Symbolic Logic 1966

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