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Propositional proof systems, the consistency of first order theories and the complexity of computations

Published online by Cambridge University Press:  12 March 2014

Jan Krajíček
Affiliation:
Mathematical Institute, Czechoslovak Academy of Sciences, 115 67 Prague 1, Czechoslovakia
Pavel Pudlák
Affiliation:
Mathematical Institute, Czechoslovak Academy of Sciences, 115 67 Prague 1, Czechoslovakia

Abstract

We consider the problem about the length of proofs of the sentences saying that there is no proof of contradiction in S whose length is < n. We show the relation of this problem to some problems about propositional proof systems.

Information

Type
Research Article
Copyright
Copyright © Association for Symbolic Logic 1989

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