Herbrand Constructivization for Automated Intuitionistic Theorem Proving

  • Gabriel EbnerEmail author
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 11714)


We describe a new method to constructivize proofs based on Herbrand disjunctions by giving a practically effective algorithm that converts (some) classical first-order proofs into intuitionistic proofs. Together with an automated classical first-order theorem prover such a method yields an (incomplete) automated theorem prover for intuitionistic logic. Our implementation of this prover approach, Slakje, performs competitively on the ILTP benchmark suite for intuitionistic provers: it solves 1674 out of 2670 problems (1290 proofs and 384 claims of non-provability) with Vampire as a backend, including 800 previously unsolved problems.



The author would like to thank the anonymous reviewers for their suggestions which have led to a considerable improvement of this paper. This work has been supported by the Vienna Science and Technology Fund (WWTF) project VRG12-004.


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Authors and Affiliations

  1. 1.TU WienViennaAustria

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