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Documents authored by Bonelli, Eduardo

Document
DOI: 10.4230/LIPIcs.CSL.2023.8
Reductions in Higher-Order Rewriting and Their Equivalence

Authors: Pablo Barenbaum and Eduardo Bonelli

Published in: LIPIcs, Volume 252, 31st EACSL Annual Conference on Computer Science Logic (CSL 2023)

Abstract
Proof terms are syntactic expressions that represent computations in term rewriting. They were introduced by Meseguer and exploited by van Oostrom and de Vrijer to study equivalence of reductions in (left-linear) first-order term rewriting systems. We study the problem of extending the notion of proof term to higher-order rewriting, which generalizes the first-order setting by allowing terms with binders and higher-order substitution. In previous works that devise proof terms for higher-order rewriting, such as Bruggink’s, it has been noted that the challenge lies in reconciling composition of proof terms and higher-order substitution (β-equivalence). This led Bruggink to reject "nested" composition, other than at the outermost level. In this paper, we propose a notion of higher-order proof term we dub rewrites that supports nested composition. We then define two notions of equivalence on rewrites, namely permutation equivalence and projection equivalence, and show that they coincide.
Cite as

Pablo Barenbaum and Eduardo Bonelli. Reductions in Higher-Order Rewriting and Their Equivalence. In 31st EACSL Annual Conference on Computer Science Logic (CSL 2023). Leibniz International Proceedings in Informatics (LIPIcs), Volume 252, pp. 8:1-8:18, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2023)

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@InProceedings{barenbaum_et_al:LIPIcs.CSL.2023.8,
  author =	{Barenbaum, Pablo and Bonelli, Eduardo},
  title =	{{Reductions in Higher-Order Rewriting and Their Equivalence}},
  booktitle =	{31st EACSL Annual Conference on Computer Science Logic (CSL 2023)},
  pages =	{8:1--8:18},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-264-8},
  ISSN =	{1868-8969},
  year =	{2023},
  volume =	{252},
  editor =	{Klin, Bartek and Pimentel, Elaine},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.CSL.2023.8},
  URN =		{urn:nbn:de:0030-drops-174694},
  doi =		{10.4230/LIPIcs.CSL.2023.8},
  annote =	{Keywords: Term Rewriting, Higher-Order Rewriting, Proof terms, Equivalence of Computations}
}
Document
Invited Talk
DOI: 10.4230/LIPIcs.CSL.2020.4
Strong Bisimulation for Control Operators (Invited Talk)

Authors: Delia Kesner, Eduardo Bonelli, and Andrés Viso

Published in: LIPIcs, Volume 152, 28th EACSL Annual Conference on Computer Science Logic (CSL 2020)

Abstract
The purpose of this paper is to identify programs with control operators whose reduction semantics are in exact correspondence. This is achieved by introducing a relation ≃, defined over a revised presentation of Parigot’s λμ-calculus we dub ΛM. Our result builds on two fundamental ingredients: (1) factorization of λμ-reduction into multiplicative and exponential steps by means of explicit term operators of ΛM, and (2) translation of ΛM-terms into Laurent’s polarized proof-nets (PPN) such that cut-elimination in PPN simulates our calculus. Our proposed relation ≃ is shown to characterize structural equivalence in PPN. Most notably, ≃ is shown to be a strong bisimulation with respect to reduction in ΛM, i.e. two ≃-equivalent terms have the exact same reduction semantics, a result which fails for Regnier’s σ-equivalence in λ-calculus as well as for Laurent’s σ-equivalence in λμ.
Cite as

Delia Kesner, Eduardo Bonelli, and Andrés Viso. Strong Bisimulation for Control Operators (Invited Talk). In 28th EACSL Annual Conference on Computer Science Logic (CSL 2020). Leibniz International Proceedings in Informatics (LIPIcs), Volume 152, pp. 4:1-4:23, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2020)

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@InProceedings{kesner_et_al:LIPIcs.CSL.2020.4,
  author =	{Kesner, Delia and Bonelli, Eduardo and Viso, Andr\'{e}s},
  title =	{{Strong Bisimulation for Control Operators}},
  booktitle =	{28th EACSL Annual Conference on Computer Science Logic (CSL 2020)},
  pages =	{4:1--4:23},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-132-0},
  ISSN =	{1868-8969},
  year =	{2020},
  volume =	{152},
  editor =	{Fern\'{a}ndez, Maribel and Muscholl, Anca},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.CSL.2020.4},
  URN =		{urn:nbn:de:0030-drops-116473},
  doi =		{10.4230/LIPIcs.CSL.2020.4},
  annote =	{Keywords: Lambda-mu calculus, proof-nets, strong bisimulation}
}
Document
DOI: 10.4230/LIPIcs.TYPES.2015.6
Efficient Type Checking for Path Polymorphism

Authors: Juan Edi, Andrés Viso, and Eduardo Bonelli

Published in: LIPIcs, Volume 69, 21st International Conference on Types for Proofs and Programs (TYPES 2015) (2018)

Abstract
A type system combining type application, constants as types, union types (associative, commutative and idempotent) and recursive types has recently been proposed for statically typing path polymorphism, the ability to define functions that can operate uniformly over recursively specified applicative data structures. A typical pattern such functions resort to is \dataterm{x}{y} which decomposes a compound, in other words any applicative tree structure, into its parts. We study type-checking for this type system in two stages. First we propose algorithms for checking type equivalence and subtyping based on coinductive characterizations of those relations. We then formulate a syntax-directed presentation and prove its equivalence with the original one. This yields a type-checking algorithm which unfortunately has exponential time complexity in the worst case. A second algorithm is then proposed, based on automata techniques, which yields a polynomial-time type-checking algorithm.
Cite as

Juan Edi, Andrés Viso, and Eduardo Bonelli. Efficient Type Checking for Path Polymorphism. In 21st International Conference on Types for Proofs and Programs (TYPES 2015). Leibniz International Proceedings in Informatics (LIPIcs), Volume 69, pp. 6:1-6:23, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2018)

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@InProceedings{edi_et_al:LIPIcs.TYPES.2015.6,
  author =	{Edi, Juan and Viso, Andr\'{e}s and Bonelli, Eduardo},
  title =	{{Efficient Type Checking for Path Polymorphism}},
  booktitle =	{21st International Conference on Types for Proofs and Programs (TYPES 2015)},
  pages =	{6:1--6:23},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-030-9},
  ISSN =	{1868-8969},
  year =	{2018},
  volume =	{69},
  editor =	{Uustalu, Tarmo},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.TYPES.2015.6},
  URN =		{urn:nbn:de:0030-drops-84761},
  doi =		{10.4230/LIPIcs.TYPES.2015.6},
  annote =	{Keywords: lambda-calculus, pattern matching, path polymorphism, type checking}
}
Document
DOI: 10.4230/LIPIcs.FSCD.2017.9
Optimality and the Linear Substitution Calculus

Authors: Pablo Barenbaum and Eduardo Bonelli

Published in: LIPIcs, Volume 84, 2nd International Conference on Formal Structures for Computation and Deduction (FSCD 2017)

Abstract
We lift the theory of optimal reduction to a decomposition of the lambda calculus known as the Linear Substitution Calculus (LSC). LSC decomposes beta-reduction into finer steps that manipulate substitutions in two distinctive ways: it uses context rules that allow substitutions to act "at a distance" and rewrites modulo a set of equations that allow substitutions to "float" in a term. We propose a notion of redex family obtained by adapting Lévy labels to support these two distinctive features. This is followed by a proof of the finite family developments theorem (FFD). We then apply FFD to prove an optimal reduction theorem for LSC. We also apply FFD to deduce additional novel properties of LSC, namely an algorithm for standardisation by selection and normalisation of a linear call-by-need reduction strategy. All results are proved in the axiomatic setting of Glauert and Khashidashvili's Deterministic Residual Structures.
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Pablo Barenbaum and Eduardo Bonelli. Optimality and the Linear Substitution Calculus. In 2nd International Conference on Formal Structures for Computation and Deduction (FSCD 2017). Leibniz International Proceedings in Informatics (LIPIcs), Volume 84, pp. 9:1-9:16, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2017)

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@InProceedings{barenbaum_et_al:LIPIcs.FSCD.2017.9,
  author =	{Barenbaum, Pablo and Bonelli, Eduardo},
  title =	{{Optimality and the Linear Substitution Calculus}},
  booktitle =	{2nd International Conference on Formal Structures for Computation and Deduction (FSCD 2017)},
  pages =	{9:1--9:16},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-047-7},
  ISSN =	{1868-8969},
  year =	{2017},
  volume =	{84},
  editor =	{Miller, Dale},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.FSCD.2017.9},
  URN =		{urn:nbn:de:0030-drops-77307},
  doi =		{10.4230/LIPIcs.FSCD.2017.9},
  annote =	{Keywords: Rewriting, Lambda Calculus, Explicit Substitutions, Optimal Reduction}
}
Document
DOI: 10.4230/LIPIcs.RTA.2012.117
Normalisation for Dynamic Pattern Calculi

Authors: Eduardo Bonelli, Delia Kesner, Carlos Lombardi, and Alejandro Rios

Published in: LIPIcs, Volume 15, 23rd International Conference on Rewriting Techniques and Applications (RTA'12) (2012)

Abstract
The Pure Pattern Calculus (PPC) extends the lambda-calculus, as well as the family of algebraic pattern calculi, with first-class patterns; that is, patterns can be passed as arguments, evaluated and returned as results. The notion of matching failure of the PPC not only provides a mechanism to define functions by pattern matching on cases but also supplies PPC with parallel-or-like, non-sequential behaviour. Therefore, devising normalising strategies for PPC to obtain well-behaved implementations turns out to be challenging. This paper focuses on normalising reduction strategies for PPC. We define a (multistep) strategy and show that it is normalising. The strategy generalises the leftmost-outermost strategy for lambda-calculus and is strictly finer than parallel-outermost. The normalisation proof is based on the notion of necessary set of redexes, a generalisation of the notion of needed redex encompassing non-sequential reduction systems.
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Eduardo Bonelli, Delia Kesner, Carlos Lombardi, and Alejandro Rios. Normalisation for Dynamic Pattern Calculi. In 23rd International Conference on Rewriting Techniques and Applications (RTA'12). Leibniz International Proceedings in Informatics (LIPIcs), Volume 15, pp. 117-132, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2012)

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@InProceedings{bonelli_et_al:LIPIcs.RTA.2012.117,
  author =	{Bonelli, Eduardo and Kesner, Delia and Lombardi, Carlos and Rios, Alejandro},
  title =	{{Normalisation for Dynamic Pattern Calculi}},
  booktitle =	{23rd International Conference on Rewriting Techniques and Applications (RTA'12)},
  pages =	{117--132},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-939897-38-5},
  ISSN =	{1868-8969},
  year =	{2012},
  volume =	{15},
  editor =	{Tiwari, Ashish},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.RTA.2012.117},
  URN =		{urn:nbn:de:0030-drops-34889},
  doi =		{10.4230/LIPIcs.RTA.2012.117},
  annote =	{Keywords: Pattern calculi, reduction strategies, sequentiality, neededness}
}
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