News

to be updated...

April 2017: Invited lecture on Calculemus!: Analyse von Kurt Gödel's Gottesbeweis mit dem Computer by Christoph Benzmüller at Urania Berlin on June 16th 2017.

March 2017: On March 27th, 4pm, Christoph Benzmüller gives an invited lecture on Computational Metaphysics: The Virtues of Formal Proofs Beyond Math in the scope of ILIAS Distinguished Lectures at University of Luxembourg (Maison du Savoir, Room 04-4.020, Campus Belval).

General Information

Consistent, rational argumentation in politics (and other contexts) seems on the retreat, while socially dangerous, inconsistent and irrational propaganda is on the rise. The question is whether knowledge representation and reasoning techniques from artificial intelligence can help to analyse and rigorously assess arguments in politics (and beyond). The objective of CRAP is to exemplarily formalise selected arguments on the computer using Benzmüller's shallow semantical embedding technique, and to subsequently assess their deep logical representations using latest automated reasoning technology. CRAP wants to raise awareness of logical consistency as an essential ingredient of rational argumentation.
In the past decades powerful proof assistants with trusted logical kernels have been developed, and in own work (and that of others) they have been successfully applied in frontier applications in mathematics and metaphysics. However, the deep logical analysis of political arguments is a challenge no one has attempted before. Political rhetoric is often messy, contains noise, and plays with ambiguities and near fallacies. It is here where a respective computer-supported methodology for formal argument assessment could have a significant impact, when being applied to some carefully selected arguments from recent political debates. Their scientific dissection in combination with a careful reflection and (public) discussion of the results could eventually raise the awareness about the nature, the danger and the patterns of irrationality that is rapidly spreading out in today's political culture.

See also Volkswagenstiftung project index

Team

Core project team

Principal investigator (PI)
Christoph Benzmüller
Researchers
David Fuenmayor, Alexander Steen

Collaboration partners

Local collaboration
Tobias Gleißner, Max Wisniewski
International cooperations
Xavier Parent and Leon van der Torre (University of Luxembourg)

Resources and Further References

Formalizations

To be provided soon.

Leo-III

In the Leo-III project, we turn LEO-II into a state-of-the-art theorem prover based on ordered paramodulation/ superposition. In constrast to LEO-II, we replace the internal term representation (the commonly used simply typed lambda calculus) by a more expressive system supporting type polymorphism. In the course of the project, we plan to further enhance the type system with type classes and type constructors similar to System Fω . In order to achieve a substantial performance speed-up, the architecture of Leo-III will be based on massive parallelism (e.g. And/Or-Parallelism, Multisearch).

More information can be found on the Leo-III project web site.

LEO-II

LEO-II is a standalone, resolution-based higher-order theorem prover designed for fruitful cooperation with specialist provers for natural fragments of higher-order logic. At present LEO-II can cooperate with TPTP compliant first-order automated theorem provers such as E, SPASS, Gandalf and Vampire. LEO-II was the winner of the THF division (automation of higher-order logic) at CASC-J5. LEO-II was the first theorem prover to support THF, FOF and CNF syntax.

More information can be found on the LEO-II project web site.

Publications

Selected list of relevant publications (reverse chronological order):

  • Computational Hermeneutics: Using Computers for the Logical Analysis of Natural-Language Arguments (David Fuenmayor, Christoph Benzmüller), CLAR 2018. To appear.
  • Computational Hermeneutics: Using Computers to Interpret Philosophical Arguments (David Fuenmayor, Christoph Benzmüller), In Logical Correctness, Workshop at UNILOG'2018, UNILOG'2018 Book of Abstracts, 2018.
  • The Higher-Order Prover Leo-III (Alexander Steen, Christoph Benzmüller), In Automated Reasoning --- 9th International Joint Conference, IJCAR 2018, Oxford, UK, July 14-17, 2018, Proceedings (Didier Galmiche, Stephan Schulz, Roberto Sebastiani, eds.), Springer, LNCS, 2018. To appear.
  • The Higher-Order Prover Leo-III(Extended Version) (Alexander Steen, Christoph Benzmüller), Technical report, CoRR, 2018. (https://arxiv.org/abs/1802.02732, preprint of IJCAR 2018 paper)
  • A Case Study on Computational Hermeneutics: E. J. Lowe's Modal Ontological Argument (David Fuenmayor, Christoph Benzmüller), Technical report, PhilPapers, 2017. (https://philpapers.org/rec/FUEACS)
  • Computer-assisted Reconstruction and Assessment of E. J. Lowe's Modal Ontological Argument (David Fuenmayor, Christoph Benzmüller), In Archive of Formal Proofs, 2017. (This publication is machine verified with Isabelle/HOL)