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Phase Semantics for Linear Logic with Least and Greatest Fixed Points

Authors Abhishek De, Farzad Jafarrahmani, Alexis Saurin

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Author Details

Abhishek De
  • IRIF, Université Paris Cité, CNRS & INRIA $π.r^2$, France
Farzad Jafarrahmani
  • IRIF, Université Paris Cité, CNRS & INRIA $π.r^2$, France
Alexis Saurin
  • IRIF, CNRS, Université Paris Cité & INRIA $π.r^2$, France

Funding

This research has been partially supported by ANR project RECIPROG, project reference ANR-21-CE48-019-01.
  • De, Abhishek: This author has received funding from the European Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement No 754362.

Acknowledgements

We would like to thank anonymous reviewers for their valuable comments that enhanced the clarity and presentation of this paper. We would like to thank Amina Doumane, Graham Leigh and Rémi Nollet for helpful discussions in the early phase of this work.

Cite AsGet BibTex

Abhishek De, Farzad Jafarrahmani, and Alexis Saurin. Phase Semantics for Linear Logic with Least and Greatest Fixed Points. In 42nd IARCS Annual Conference on Foundations of Software Technology and Theoretical Computer Science (FSTTCS 2022). Leibniz International Proceedings in Informatics (LIPIcs), Volume 250, pp. 35:1-35:23, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2022)
https://doi.org/10.4230/LIPIcs.FSTTCS.2022.35

Abstract

The truth semantics of linear logic (i.e. phase semantics) is often overlooked despite having a wide range of applications and deep connections with several denotational semantics. In phase semantics, one is concerned about the provability of formulas rather than the contents of their proofs (or refutations). Linear logic equipped with the least and greatest fixpoint operators (μMALL) has been an active field of research for the past one and a half decades. Various proof systems are known viz. finitary and non-wellfounded, based on explicit and implicit (co)induction respectively. In this paper, we extend the phase semantics of multiplicative additive linear logic (a.k.a. MALL) to μMALL with explicit (co)induction (i.e. μMALL^{ind}). We introduce a Tait-style system for μMALL called μMALL_ω where proofs are wellfounded but potentially infinitely branching. We study its phase semantics and prove that it does not have the finite model property.

Subject Classification

ACM Subject Classification
  • Theory of computation → Linear logic
  • Theory of computation → Proof theory
Keywords
  • Linear logic
  • fixed points
  • phase semantics
  • closure ordinals
  • cut elimination

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