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Factorize Factorization

Authors Beniamino Accattoli, Claudia Faggian, Giulio Guerrieri

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Author Details

Beniamino Accattoli
  • Inria & LIX, École Polytechnique, UMR 7161, Palaiseau, France
Claudia Faggian
  • Université de Paris, IRIF, CNRS, F-75013 Paris, France
Giulio Guerrieri
  • University of Bath, Department of Computer Science, Bath, UK

Funding

This work is partially supported by ANR JCJC grant "COCA HOLA" (ANR-16-CE40-004-01), ANR PRC project PPS ({ANR-19-CE48-0014}), and EPSRC Project EP/R029121/1 Typed lambda-calculi with sharing and unsharing.

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Beniamino Accattoli, Claudia Faggian, and Giulio Guerrieri. Factorize Factorization. In 29th EACSL Annual Conference on Computer Science Logic (CSL 2021). Leibniz International Proceedings in Informatics (LIPIcs), Volume 183, pp. 6:1-6:25, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2021) https://doi.org/10.4230/LIPIcs.CSL.2021.6

Abstract

We present a new technique for proving factorization theorems for compound rewriting systems in a modular way, which is inspired by the Hindley-Rosen technique for confluence. Specifically, our approach is well adapted to deal with extensions of the call-by-name and call-by-value λ-calculi.
The technique is first developed abstractly. We isolate a sufficient condition (called linear swap) for lifting factorization from components to the compound system, and which is compatible with β-reduction. We then closely analyze some common factorization schemas for the λ-calculus.
Concretely, we apply our technique to diverse extensions of the λ-calculus, among which de' Liguoro and Piperno’s non-deterministic λ-calculus and - for call-by-value - Carraro and Guerrieri’s shuffling calculus. For both calculi the literature contains factorization theorems. In both cases, we give a new proof which is neat, simpler than the original, and strikingly shorter.

Subject Classification

ACM Subject Classification
  • Theory of computation → Rewrite systems
  • Theory of computation → Lambda calculus
  • Theory of computation → Logic
Keywords
  • Lambda Calculus
  • Rewriting
  • Reduction Strategies
  • Factorization

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