On Model-Theoretic Strong Normalization for Truth-Table Natural Deduction

Author Andreas Abel

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Author Details

Andreas Abel
  • Department of Computer Science and Engineering, Chalmers University of Technology, Göteborg, Sweden
  • Gothenburg University, Göteborg, Sweden


Thanks to Herman Geuvers for explaining me truth-table natural deduction during a 2018 visit to Nijmegen for the purpose of Henning Basold’s PhD ceremony. Thanks to Ralph Matthes, Herman Geuvers and Tonny Hurkens for some email discussions on the topics of this article. I am also grateful for the feedback of the reviewer that led to a substantial clarification of the proof using orthogonality.

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Andreas Abel. On Model-Theoretic Strong Normalization for Truth-Table Natural Deduction. In 26th International Conference on Types for Proofs and Programs (TYPES 2020). Leibniz International Proceedings in Informatics (LIPIcs), Volume 188, pp. 1:1-1:21, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2021)


Intuitionistic truth table natural deduction (ITTND) by Geuvers and Hurkens (2017), which is inherently non-confluent, has been shown strongly normalizing (SN) using continuation-passing-style translations to parallel lambda calculus by Geuvers, van der Giessen, and Hurkens (2019). We investigate the applicability of standard model-theoretic proof techniques and show (1) SN of detour reduction (β) using Girard’s reducibility candidates, and (2) SN of detour and permutation reduction (βπ) using biorthogonals. In the appendix, we adapt Tait’s method of saturated sets to β, clarifying the original proof of 2017, and extend it to βπ.

Subject Classification

ACM Subject Classification
  • Theory of computation → Proof theory
  • Natural deduction
  • Permutative conversion
  • Reducibility
  • Strong normalization
  • Truth table


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