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Documents authored by Sangiorgi, Davide

Document
Invited Talk
DOI: 10.4230/LIPIcs.CSL.2023.4
Enhanced Induction in Behavioural Relations (Invited Talk)

Authors: Davide Sangiorgi

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

Abstract
We outline an attempt at transporting the well-known theory of enhancements for the coinduction proof method, widely used on behavioural relations such as bisimilarity, onto the realms of inductive behaviour relations, i.e., relations defined from inductive observables, and discuss relevant literature.
Cite as

Davide Sangiorgi. Enhanced Induction in Behavioural Relations (Invited Talk). In 31st EACSL Annual Conference on Computer Science Logic (CSL 2023). Leibniz International Proceedings in Informatics (LIPIcs), Volume 252, pp. 4:1-4:6, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2023)

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@InProceedings{sangiorgi:LIPIcs.CSL.2023.4,
  author =	{Sangiorgi, Davide},
  title =	{{Enhanced Induction in Behavioural Relations}},
  booktitle =	{31st EACSL Annual Conference on Computer Science Logic (CSL 2023)},
  pages =	{4:1--4:6},
  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.2023.4},
  URN =		{urn:nbn:de:0030-drops-174658},
  doi =		{10.4230/LIPIcs.CSL.2023.4},
  annote =	{Keywords: coinduction, induction, semantics, behavioural relations}
}
Document
Invited Paper
DOI: 10.4230/LIPIcs.CONCUR.2022.1
CONCUR Test-Of-Time Award 2022 (Invited Paper)

Authors: Ilaria Castellani, Paul Gastin, Orna Kupferman, Mickael Randour, and Davide Sangiorgi

Published in: LIPIcs, Volume 243, 33rd International Conference on Concurrency Theory (CONCUR 2022)

Abstract
This short article recaps the purpose of the CONCUR Test-of-Time Award and presents the four papers that received the Award in 2022.
Cite as

Ilaria Castellani, Paul Gastin, Orna Kupferman, Mickael Randour, and Davide Sangiorgi. CONCUR Test-Of-Time Award 2022 (Invited Paper). In 33rd International Conference on Concurrency Theory (CONCUR 2022). Leibniz International Proceedings in Informatics (LIPIcs), Volume 243, pp. 1:1-1:3, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2022)

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@InProceedings{castellani_et_al:LIPIcs.CONCUR.2022.1,
  author =	{Castellani, Ilaria and Gastin, Paul and Kupferman, Orna and Randour, Mickael and Sangiorgi, Davide},
  title =	{{CONCUR Test-Of-Time Award 2022}},
  booktitle =	{33rd International Conference on Concurrency Theory (CONCUR 2022)},
  pages =	{1:1--1:3},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-246-4},
  ISSN =	{1868-8969},
  year =	{2022},
  volume =	{243},
  editor =	{Klin, Bartek and Lasota, S{\l}awomir and Muscholl, Anca},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/LIPIcs.CONCUR.2022.1},
  URN =		{urn:nbn:de:0030-drops-170644},
  doi =		{10.4230/LIPIcs.CONCUR.2022.1},
  annote =	{Keywords: CONCUR Test-of-Time Award}
}
Document
DOI: 10.4230/LIPIcs.CSL.2022.25
Games, Mobile Processes, and Functions

Authors: Guilhem Jaber and Davide Sangiorgi

Published in: LIPIcs, Volume 216, 30th EACSL Annual Conference on Computer Science Logic (CSL 2022)

Abstract
We establish a tight connection between two models of the λ-calculus, namely Milner’s encoding into the π-calculus (precisely, the Internal π-calculus), and operational game semantics (OGS). We first investigate the operational correspondence between the behaviours of the encoding provided by π and OGS. We do so for various LTSs: the standard LTS for π and a new "concurrent" LTS for OGS; an "output-prioritised" LTS for π and the standard alternating LTS for OGS. We then show that the equivalences induced on λ-terms by all these LTSs (for π and OGS) coincide. These connections allow us to transfer results and techniques between π and OGS. In particular we import up-to techniques from π onto OGS and we derive congruence and compositionality results for OGS from those of π. The study is illustrated for call-by-value; similar results hold for call-by-name.
Cite as

Guilhem Jaber and Davide Sangiorgi. Games, Mobile Processes, and Functions. In 30th EACSL Annual Conference on Computer Science Logic (CSL 2022). Leibniz International Proceedings in Informatics (LIPIcs), Volume 216, pp. 25:1-25:18, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2022)

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@InProceedings{jaber_et_al:LIPIcs.CSL.2022.25,
  author =	{Jaber, Guilhem and Sangiorgi, Davide},
  title =	{{Games, Mobile Processes, and Functions}},
  booktitle =	{30th EACSL Annual Conference on Computer Science Logic (CSL 2022)},
  pages =	{25:1--25:18},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-218-1},
  ISSN =	{1868-8969},
  year =	{2022},
  volume =	{216},
  editor =	{Manea, Florin and Simpson, Alex},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/LIPIcs.CSL.2022.25},
  URN =		{urn:nbn:de:0030-drops-157450},
  doi =		{10.4230/LIPIcs.CSL.2022.25},
  annote =	{Keywords: \lambda-calculus, \pi-calculus, game semantics}
}
Document
DOI: 10.4230/OASIcs.Gabbrielli.5
The Servers of Serverless Computing: A Formal Revisitation of Functions as a Service

Authors: Saverio Giallorenzo, Ivan Lanese, Fabrizio Montesi, Davide Sangiorgi, and Stefano Pio Zingaro

Published in: OASIcs, Volume 86, Recent Developments in the Design and Implementation of Programming Languages (2020)

Abstract
Serverless computing is a paradigm for programming cloud applications in terms of stateless functions, executed and scaled in proportion to inbound requests. Here, we revisit SKC, a calculus capturing the essential features of serverless programming. By exploring the design space of the language, we refined the integration between the fundamental features of the two calculi that inspire SKC: the λ- and the π-calculus. That investigation led us to a revised syntax and semantics, which support an increase in the expressiveness of the language. In particular, now function names are first-class citizens and can be passed around. To illustrate the new features, we present step-by-step examples and two non-trivial use cases from artificial intelligence, which model, respectively, a perceptron and an image tagging system into compositions of serverless functions. We also illustrate how SKC supports reasoning on serverless implementations, i.e., the underlying network of communicating, concurrent, and mobile processes which execute serverless functions in the cloud. To that aim, we show an encoding from SKC to the asynchronous π-calculus and prove it correct in terms of an operational correspondence. Dedicated to Maurizio Gabbrielli, on his 60th birthday (... rob da mët ! )
Cite as

Saverio Giallorenzo, Ivan Lanese, Fabrizio Montesi, Davide Sangiorgi, and Stefano Pio Zingaro. The Servers of Serverless Computing: A Formal Revisitation of Functions as a Service. In Recent Developments in the Design and Implementation of Programming Languages. Open Access Series in Informatics (OASIcs), Volume 86, pp. 5:1-5:21, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2020)

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@InProceedings{giallorenzo_et_al:OASIcs.Gabbrielli.5,
  author =	{Giallorenzo, Saverio and Lanese, Ivan and Montesi, Fabrizio and Sangiorgi, Davide and Zingaro, Stefano Pio},
  title =	{{The Servers of Serverless Computing: A Formal Revisitation of Functions as a Service}},
  booktitle =	{Recent Developments in the Design and Implementation of Programming Languages},
  pages =	{5:1--5:21},
  series =	{Open Access Series in Informatics (OASIcs)},
  ISBN =	{978-3-95977-171-9},
  ISSN =	{2190-6807},
  year =	{2020},
  volume =	{86},
  editor =	{de Boer, Frank S. and Mauro, Jacopo},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/OASIcs.Gabbrielli.5},
  URN =		{urn:nbn:de:0030-drops-132271},
  doi =		{10.4230/OASIcs.Gabbrielli.5},
  annote =	{Keywords: Serverless computing, Process calculi, Pi-calculus}
}
Document
DOI: 10.4230/LIPIcs.CONCUR.2020.34
On the Representation of References in the Pi-Calculus

Authors: Daniel Hirschkoff, Enguerrand Prebet, and Davide Sangiorgi

Published in: LIPIcs, Volume 171, 31st International Conference on Concurrency Theory (CONCUR 2020)

Abstract
The π-calculus has been advocated as a model to interpret, and give semantics to, languages with higher-order features. Often these languages make use of forms of references (and hence viewing a store as set of references). While translations of references in π-calculi (and CCS) have appeared, the precision of such translations has not been fully investigated. In this paper we address this issue. We focus on the asynchronous π-calculus (Aπ), where translations of references are simpler. We first define π^ref, an extension of Aπ with references and operators to manipulate them, and illustrate examples of the subtleties of behavioural equivalence in π^ref. We then consider a translation of π^ref into Aπ. References of π^ref are mapped onto names of Aπ belonging to a dedicated "reference" type. We show how the presence of reference names affects the definition of barbed congruence. We establish full abstraction of the translation w.r.t. barbed congruence and barbed equivalence in the two calculi. We investigate proof techniques for barbed equivalence in Aπ, based on two forms of labelled bisimilarities. For one bisimilarity we derive both soundness and completeness; for another, more efficient and involving an inductive "game" on reference names, we derive soundness, leaving completeness open. Finally, we discuss examples of uses of the bisimilarities.
Cite as

Daniel Hirschkoff, Enguerrand Prebet, and Davide Sangiorgi. On the Representation of References in the Pi-Calculus. In 31st International Conference on Concurrency Theory (CONCUR 2020). Leibniz International Proceedings in Informatics (LIPIcs), Volume 171, pp. 34:1-34:20, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2020)

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@InProceedings{hirschkoff_et_al:LIPIcs.CONCUR.2020.34,
  author =	{Hirschkoff, Daniel and Prebet, Enguerrand and Sangiorgi, Davide},
  title =	{{On the Representation of References in the Pi-Calculus}},
  booktitle =	{31st International Conference on Concurrency Theory (CONCUR 2020)},
  pages =	{34:1--34:20},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-160-3},
  ISSN =	{1868-8969},
  year =	{2020},
  volume =	{171},
  editor =	{Konnov, Igor and Kov\'{a}cs, Laura},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/LIPIcs.CONCUR.2020.34},
  URN =		{urn:nbn:de:0030-drops-128466},
  doi =		{10.4230/LIPIcs.CONCUR.2020.34},
  annote =	{Keywords: Process calculus, Bisimulation, Asynchrony, Imperative programming}
}
Document
DOI: 10.4230/LIPIcs.CONCUR.2017.11
Divergence and Unique Solution of Equations

Authors: Adrien Durier, Daniel Hirschkoff, and Davide Sangiorgi

Published in: LIPIcs, Volume 85, 28th International Conference on Concurrency Theory (CONCUR 2017)

Abstract
We study proof techniques for bisimilarity based on unique solution of equations. We draw inspiration from a result by Roscoe in the denotational setting of CSP and for failure semantics, essentially stating that an equation (or a system of equations) whose infinite unfolding never produces a divergence has the unique-solution property. We transport this result onto the operational setting of CCS and for bisimilarity. We then exploit the operational approach to: refine the theorem, distinguishing between different forms of divergence; derive an abstract formulation of the theorems, on generic LTSs; adapt the theorems to other equivalences such as trace equivalence, and to preorders such as trace inclusion. We compare the resulting techniques to enhancements of the bisimulation proof method (the ‘up-to techniques’). Finally, we study the theorems in name-passing calculi such as the asynchronous pi-calculus, and revisit the completeness proof of Milner’s encoding of the lambda-calculus into the pi-calculus for Lévy-Longo Trees.
Cite as

Adrien Durier, Daniel Hirschkoff, and Davide Sangiorgi. Divergence and Unique Solution of Equations. In 28th International Conference on Concurrency Theory (CONCUR 2017). Leibniz International Proceedings in Informatics (LIPIcs), Volume 85, pp. 11:1-11:16, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2017)

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@InProceedings{durier_et_al:LIPIcs.CONCUR.2017.11,
  author =	{Durier, Adrien and Hirschkoff, Daniel and Sangiorgi, Davide},
  title =	{{Divergence and Unique Solution of Equations}},
  booktitle =	{28th International Conference on Concurrency Theory (CONCUR 2017)},
  pages =	{11:1--11:16},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-048-4},
  ISSN =	{1868-8969},
  year =	{2017},
  volume =	{85},
  editor =	{Meyer, Roland and Nestmann, Uwe},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/LIPIcs.CONCUR.2017.11},
  URN =		{urn:nbn:de:0030-drops-77849},
  doi =		{10.4230/LIPIcs.CONCUR.2017.11},
  annote =	{Keywords: Bisimilarity, unique solution of equations, termination, process calculi}
}
Document
Complete Volume
DOI: 10.4230/LIPIcs.ICALP.2016
LIPIcs, Volume 55, ICALP'16, Complete Volume

Authors: Ioannis Chatzigiannakis, Michael Mitzenmacher, Yuval Rabani, and Davide Sangiorgi

Published in: LIPIcs, Volume 55, 43rd International Colloquium on Automata, Languages, and Programming (ICALP 2016)

Abstract
LIPIcs, Volume 55, ICALP'16, Complete Volume
Cite as

43rd International Colloquium on Automata, Languages, and Programming (ICALP 2016). Leibniz International Proceedings in Informatics (LIPIcs), Volume 55, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2016)

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@Proceedings{chatzigiannakis_et_al:LIPIcs.ICALP.2016,
  title =	{{LIPIcs, Volume 55, ICALP'16, Complete Volume}},
  booktitle =	{43rd International Colloquium on Automata, Languages, and Programming (ICALP 2016)},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-013-2},
  ISSN =	{1868-8969},
  year =	{2016},
  volume =	{55},
  editor =	{Chatzigiannakis, Ioannis and Mitzenmacher, Michael and Rabani, Yuval and Sangiorgi, Davide},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/LIPIcs.ICALP.2016},
  URN =		{urn:nbn:de:0030-drops-65844},
  doi =		{10.4230/LIPIcs.ICALP.2016},
  annote =	{Keywords: Theory of Computation}
}
Document
Front Matter
DOI: 10.4230/LIPIcs.ICALP.2016.0
Front Matter, Table of Contents, Preface, Organization, List of Authors

Authors: Ioannis Chatzigiannakis, Michael Mitzenmacher, Yuval Rabani, and Davide Sangiorgi

Published in: LIPIcs, Volume 55, 43rd International Colloquium on Automata, Languages, and Programming (ICALP 2016)

Abstract
Front Matter, Table of Contents, Preface, Organization, List of Authors
Cite as

43rd International Colloquium on Automata, Languages, and Programming (ICALP 2016). Leibniz International Proceedings in Informatics (LIPIcs), Volume 55, pp. 0:i-0:xliv, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2016)

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@InProceedings{chatzigiannakis_et_al:LIPIcs.ICALP.2016.0,
  author =	{Chatzigiannakis, Ioannis and Mitzenmacher, Michael and Rabani, Yuval and Sangiorgi, Davide},
  title =	{{Front Matter, Table of Contents, Preface, Organization, List of Authors}},
  booktitle =	{43rd International Colloquium on Automata, Languages, and Programming (ICALP 2016)},
  pages =	{0:i--0:xliv},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-013-2},
  ISSN =	{1868-8969},
  year =	{2016},
  volume =	{55},
  editor =	{Chatzigiannakis, Ioannis and Mitzenmacher, Michael and Rabani, Yuval and Sangiorgi, Davide},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/LIPIcs.ICALP.2016.0},
  URN =		{urn:nbn:de:0030-drops-61917},
  doi =		{10.4230/LIPIcs.ICALP.2016.0},
  annote =	{Keywords: Front Matter, Table of Contents, Preface, Organization, List of Authors}
}
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