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The cut-elimination method CERES (for first-and higher-order classical logic) is based on the notion of a characteristic clause set, which is extracted from an LK-proof and is always unsatisfiable. A resolution refutation of this clause set can be used as a skeleton for a proof with atomic cuts only (atomic cut normal form). This is achieved by replacing(More)
This paper introduces PROOFTOOL, the graphical user interface for the General Architecture for Proof Theory (GAPT) framework. Its features are described with a focus not only on the visual-ization but also on the analysis and transformation of proofs and related tree-like structures, and its implementation is explained. Finally, PROOFTOOL is compared with(More)
Computer-generated proofs are usually difficult to grasp for a human reader. In this paper we present an approach to understanding resolution proofs through Herbrand's theorem and the implementation of a tool based on that approach. The information we take as primitive is which instances have been chosen for which quantifiers, in other words: an expansion(More)
This paper describes the implementation, as well as the features, of the graphical user interface, more specifically defined as a proof viewer, for the General Architecture for Proof Theory (GAPT) framework. It contains methods to render classical and schematic sequent calculus proofs as well as resolution proofs and other tree-like structures in a flexible(More)
This paper describes a new feature of the GAPT framework, namely the ability to import refutations obtained from external automated theorem provers. To cope with coarse-grained, under-specified and non-standard inference rules used by various theorem provers, the technique of proof replaying is employed. The refutations provided by external theorem provers(More)
Hiermit erkläre ich, dass ich diese Arbeit selbständig verfasst habe, dass ich die verwendeten Quellen und Hilfsmittel vollständig angegeben habe und dass ich die Stellen der Arbeit einschließlich Tabellen, Karten und Abbildungen, die anderen Werken oder dem Internet im Wortlaut oder dem Sinn nach entnommen sind, auf jeden Fall unter Angabe der Quelle als(More)
(Ort, Datum) (Unterschrift Verfasser) i Acknowledgements I would like to express my deepest gratitude to my advisor, Alexander Leitsch. First for allowing me to participate in the interesting multidisciplinary research done in his group. Second, for showing great patience when my own interest deviated a little from the project goals before converging again(More)
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