Böhm and Taylor for All!

Authors Aloÿs Dufour, Damiano Mazza



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Author Details

Aloÿs Dufour
  • Université Sorbonne Paris Nord, LIPN, CNRS, Villetaneuse, France
Damiano Mazza
  • CNRS, LIPN, Université Sorbonne Paris Nord, Villetaneuse, France

Acknowledgements

The authors wish to thank Michele Pagani, who pointed out Lemma 23.

Cite As Get BibTex

Aloÿs Dufour and Damiano Mazza. Böhm and Taylor for All!. In 9th International Conference on Formal Structures for Computation and Deduction (FSCD 2024). Leibniz International Proceedings in Informatics (LIPIcs), Volume 299, pp. 29:1-29:20, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2024) https://doi.org/10.4230/LIPIcs.FSCD.2024.29

Abstract

Böhm approximations, used in the definition of Böhm trees, are a staple of the semantics of the lambda-calculus. Introduced more recently by Ehrhard and Regnier, Taylor approximations provide a quantitative account of the behavior of programs and are well-known to be connected to intersection types. The key relation between these two notions of approximations is a commutation theorem, roughly stating that Taylor approximations of Böhm trees are the same as Böhm trees of Taylor approximations. Böhm and Taylor approximations are available for several variants or extensions of the lambda-calculus and, in some cases, commutation theorems are known. In this paper, we define Böhm and Taylor approximations and prove the commutation theorem in a very general setting. We also introduce (non-idempotent) intersection types at this level of generality. From this, we show how the commutation theorem and intersection types may be applied to any calculus embedding in a sufficiently nice way into our general calculus. All known Böhm-Taylor commutation theorems, as well as new ones, follow by this uniform construction.

Subject Classification

ACM Subject Classification
  • Theory of computation → Linear logic
  • Theory of computation → Denotational semantics
  • Theory of computation → Operational semantics
  • Theory of computation → Lambda calculus
  • Theory of computation → Process calculi
Keywords
  • Linear logic
  • Differential linear logic
  • Taylor expansion of lambda-terms
  • Böhm trees
  • Process calculi

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