54 Search Results for "van Glabbeek, Rob"


Volume

LIPIcs, Volume 140

30th International Conference on Concurrency Theory (CONCUR 2019)

CONCUR 2019, August 27-30, 2019, Amsterdam, the Netherlands

Editors: Wan Fokkink and Rob van Glabbeek

Document
Process-Algebraic Models of Multi-Writer Multi-Reader Non-Atomic Registers

Authors: Myrthe S. C. Spronck and Bas Luttik

Published in: LIPIcs, Volume 279, 34th International Conference on Concurrency Theory (CONCUR 2023)


Abstract
We present process-algebraic models of multi-writer multi-reader safe, regular and atomic registers. We establish the relationship between our models and alternative versions presented in the literature. We use our models to formally analyse by model checking to what extent several well-known mutual exclusion algorithms are robust for relaxed atomicity requirements. Our analyses refute correctness claims made about some of these algorithms in the literature.

Cite as

Myrthe S. C. Spronck and Bas Luttik. Process-Algebraic Models of Multi-Writer Multi-Reader Non-Atomic Registers. In 34th International Conference on Concurrency Theory (CONCUR 2023). Leibniz International Proceedings in Informatics (LIPIcs), Volume 279, pp. 5:1-5:17, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2023)


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@InProceedings{spronck_et_al:LIPIcs.CONCUR.2023.5,
  author =	{Spronck, Myrthe S. C. and Luttik, Bas},
  title =	{{Process-Algebraic Models of Multi-Writer Multi-Reader Non-Atomic Registers}},
  booktitle =	{34th International Conference on Concurrency Theory (CONCUR 2023)},
  pages =	{5:1--5:17},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-299-0},
  ISSN =	{1868-8969},
  year =	{2023},
  volume =	{279},
  editor =	{P\'{e}rez, Guillermo A. and Raskin, Jean-Fran\c{c}ois},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/LIPIcs.CONCUR.2023.5},
  URN =		{urn:nbn:de:0030-drops-189995},
  doi =		{10.4230/LIPIcs.CONCUR.2023.5},
  annote =	{Keywords: mutual exclusion, model checking, non-atomic reads and writes, regular register}
}
Document
Type Isomorphisms for Multiplicative-Additive Linear Logic

Authors: Rémi Di Guardia and Olivier Laurent

Published in: LIPIcs, Volume 260, 8th International Conference on Formal Structures for Computation and Deduction (FSCD 2023)


Abstract
We characterize type isomorphisms in the multiplicative-additive fragment of linear logic (MALL), and thus for ⋆-autonomous categories with finite products, extending a result for the multiplicative fragment by Balat and Di Cosmo [Vincent Balat and Roberto Di Cosmo, 1999]. This yields a much richer equational theory involving distributivity and annihilation laws. The unit-free case is obtained by relying on the proof-net syntax introduced by Hughes and Van Glabbeek [Dominic Hughes and Rob van Glabbeek, 2005]. We then use the sequent calculus to extend our results to full MALL (including all units).

Cite as

Rémi Di Guardia and Olivier Laurent. Type Isomorphisms for Multiplicative-Additive Linear Logic. In 8th International Conference on Formal Structures for Computation and Deduction (FSCD 2023). Leibniz International Proceedings in Informatics (LIPIcs), Volume 260, pp. 26:1-26:21, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2023)


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@InProceedings{diguardia_et_al:LIPIcs.FSCD.2023.26,
  author =	{Di Guardia, R\'{e}mi and Laurent, Olivier},
  title =	{{Type Isomorphisms for Multiplicative-Additive Linear Logic}},
  booktitle =	{8th International Conference on Formal Structures for Computation and Deduction (FSCD 2023)},
  pages =	{26:1--26:21},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-277-8},
  ISSN =	{1868-8969},
  year =	{2023},
  volume =	{260},
  editor =	{Gaboardi, Marco and van Raamsdonk, Femke},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/LIPIcs.FSCD.2023.26},
  URN =		{urn:nbn:de:0030-drops-180103},
  doi =		{10.4230/LIPIcs.FSCD.2023.26},
  annote =	{Keywords: Linear Logic, Type Isomorphisms, Multiplicative-Additive fragment, Proof nets, Sequent calculus, Star-autonomous categories with finite products}
}
Document
Kalas: A Verified, End-To-End Compiler for a Choreographic Language

Authors: Johannes Åman Pohjola, Alejandro Gómez-Londoño, James Shaker, and Michael Norrish

Published in: LIPIcs, Volume 237, 13th International Conference on Interactive Theorem Proving (ITP 2022)


Abstract
Choreographies are an abstraction for globally describing deadlock-free communicating systems. A choreography can be compiled into multiple endpoints preserving the global behavior, providing a path for concrete system implementations. Of course, the soundness of this approach hinges on the correctness of the compilation function. In this paper, we present a verified compiler for Kalas, a choreographic language. Its machine-checked end-to-end proof of correctness ensures all generated endpoints adhere to the system description, preserving the top-level communication guarantees. This work uses the verified CakeML compiler and Hol4 proof assistant, allowing for concrete executable implementations and statements of correctness at the machine code level for multiple architectures.

Cite as

Johannes Åman Pohjola, Alejandro Gómez-Londoño, James Shaker, and Michael Norrish. Kalas: A Verified, End-To-End Compiler for a Choreographic Language. In 13th International Conference on Interactive Theorem Proving (ITP 2022). Leibniz International Proceedings in Informatics (LIPIcs), Volume 237, pp. 27:1-27:18, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2022)


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@InProceedings{pohjola_et_al:LIPIcs.ITP.2022.27,
  author =	{Pohjola, Johannes \r{A}man and G\'{o}mez-Londo\~{n}o, Alejandro and Shaker, James and Norrish, Michael},
  title =	{{Kalas: A Verified, End-To-End Compiler for a Choreographic Language}},
  booktitle =	{13th International Conference on Interactive Theorem Proving (ITP 2022)},
  pages =	{27:1--27:18},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-252-5},
  ISSN =	{1868-8969},
  year =	{2022},
  volume =	{237},
  editor =	{Andronick, June and de Moura, Leonardo},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/LIPIcs.ITP.2022.27},
  URN =		{urn:nbn:de:0030-drops-167368},
  doi =		{10.4230/LIPIcs.ITP.2022.27},
  annote =	{Keywords: Choreographies, Interactive Theorem Proving, Compiler Verification}
}
Document
Invited Paper
CONCUR Test-Of-Time Award 2021 (Invited Paper)

Authors: Nathalie Bertrand, Luca de Alfaro, Rob van Glabbeek, Catuscia Palamidessi, and Nobuko Yoshida

Published in: LIPIcs, Volume 203, 32nd International Conference on Concurrency Theory (CONCUR 2021)


Abstract
This short article announces the recipients of the CONCUR Test-of-Time Award 2021.

Cite as

Nathalie Bertrand, Luca de Alfaro, Rob van Glabbeek, Catuscia Palamidessi, and Nobuko Yoshida. CONCUR Test-Of-Time Award 2021 (Invited Paper). In 32nd International Conference on Concurrency Theory (CONCUR 2021). Leibniz International Proceedings in Informatics (LIPIcs), Volume 203, pp. 1:1-1:3, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2021)


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@InProceedings{bertrand_et_al:LIPIcs.CONCUR.2021.1,
  author =	{Bertrand, Nathalie and de Alfaro, Luca and van Glabbeek, Rob and Palamidessi, Catuscia and Yoshida, Nobuko},
  title =	{{CONCUR Test-Of-Time Award 2021}},
  booktitle =	{32nd International Conference on Concurrency Theory (CONCUR 2021)},
  pages =	{1:1--1:3},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-203-7},
  ISSN =	{1868-8969},
  year =	{2021},
  volume =	{203},
  editor =	{Haddad, Serge and Varacca, Daniele},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/LIPIcs.CONCUR.2021.1},
  URN =		{urn:nbn:de:0030-drops-143786},
  doi =		{10.4230/LIPIcs.CONCUR.2021.1},
  annote =	{Keywords: Concurrency, CONCUR Test-of-Time Award}
}
Document
Enabling Preserving Bisimulation Equivalence

Authors: Rob van Glabbeek, Peter Höfner, and Weiyou Wang

Published in: LIPIcs, Volume 203, 32nd International Conference on Concurrency Theory (CONCUR 2021)


Abstract
Most fairness assumptions used for verifying liveness properties are criticised for being too strong or unrealistic. On the other hand, justness, arguably the minimal fairness assumption required for the verification of liveness properties, is not preserved by classical semantic equivalences, such as strong bisimilarity. To overcome this deficiency, we introduce a finer alternative to strong bisimilarity, called enabling preserving bisimilarity. We prove that this equivalence is justness-preserving and a congruence for all standard operators, including parallel composition.

Cite as

Rob van Glabbeek, Peter Höfner, and Weiyou Wang. Enabling Preserving Bisimulation Equivalence. In 32nd International Conference on Concurrency Theory (CONCUR 2021). Leibniz International Proceedings in Informatics (LIPIcs), Volume 203, pp. 33:1-33:20, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2021)


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@InProceedings{vanglabbeek_et_al:LIPIcs.CONCUR.2021.33,
  author =	{van Glabbeek, Rob and H\"{o}fner, Peter and Wang, Weiyou},
  title =	{{Enabling Preserving Bisimulation Equivalence}},
  booktitle =	{32nd International Conference on Concurrency Theory (CONCUR 2021)},
  pages =	{33:1--33:20},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-203-7},
  ISSN =	{1868-8969},
  year =	{2021},
  volume =	{203},
  editor =	{Haddad, Serge and Varacca, Daniele},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.CONCUR.2021.33},
  URN =		{urn:nbn:de:0030-drops-144107},
  doi =		{10.4230/LIPIcs.CONCUR.2021.33},
  annote =	{Keywords: bisimilarity, liveness properties, fairness assumptions, process algebra}
}
Document
Reactive Bisimulation Semantics for a Process Algebra with Time-Outs

Authors: Rob van Glabbeek

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


Abstract
This paper introduces the counterpart of strong bisimilarity for labelled transition systems extended with time-out transitions. It supports this concept through a modal characterisation, congruence results for a standard process algebra with recursion, and a complete axiomatisation.

Cite as

Rob van Glabbeek. Reactive Bisimulation Semantics for a Process Algebra with Time-Outs. In 31st International Conference on Concurrency Theory (CONCUR 2020). Leibniz International Proceedings in Informatics (LIPIcs), Volume 171, pp. 6:1-6:23, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2020)


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@InProceedings{vanglabbeek:LIPIcs.CONCUR.2020.6,
  author =	{van Glabbeek, Rob},
  title =	{{Reactive Bisimulation Semantics for a Process Algebra with Time-Outs}},
  booktitle =	{31st International Conference on Concurrency Theory (CONCUR 2020)},
  pages =	{6:1--6:23},
  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.dagstuhl.de/entities/document/10.4230/LIPIcs.CONCUR.2020.6},
  URN =		{urn:nbn:de:0030-drops-128181},
  doi =		{10.4230/LIPIcs.CONCUR.2020.6},
  annote =	{Keywords: Process algebra, time-outs, labelled transition systems, reactive bisimulation semantics, Hennessy-Milner logic, modal characterisations, recursion, complete axiomatisations}
}
Document
On the Axiomatisability of Parallel Composition: A Journey in the Spectrum

Authors: Luca Aceto, Valentina Castiglioni, Anna Ingólfsdóttir, Bas Luttik, and Mathias Ruggaard Pedersen

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


Abstract
This paper studies the existence of finite equational axiomatisations of the interleaving parallel composition operator modulo the behavioural equivalences in van Glabbeek’s linear time-branching time spectrum. In the setting of the process algebra BCCSP over a finite set of actions, we provide finite, ground-complete axiomatisations for various simulation and (decorated) trace semantics. On the other hand, we show that no congruence over that language that includes bisimilarity and is included in possible futures equivalence has a finite, ground-complete axiomatisation. This negative result applies to all the nested trace and nested simulation semantics.

Cite as

Luca Aceto, Valentina Castiglioni, Anna Ingólfsdóttir, Bas Luttik, and Mathias Ruggaard Pedersen. On the Axiomatisability of Parallel Composition: A Journey in the Spectrum. In 31st International Conference on Concurrency Theory (CONCUR 2020). Leibniz International Proceedings in Informatics (LIPIcs), Volume 171, pp. 18:1-18:22, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2020)


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@InProceedings{aceto_et_al:LIPIcs.CONCUR.2020.18,
  author =	{Aceto, Luca and Castiglioni, Valentina and Ing\'{o}lfsd\'{o}ttir, Anna and Luttik, Bas and Pedersen, Mathias Ruggaard},
  title =	{{On the Axiomatisability of Parallel Composition: A Journey in the Spectrum}},
  booktitle =	{31st International Conference on Concurrency Theory (CONCUR 2020)},
  pages =	{18:1--18:22},
  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.2020.18},
  URN =		{urn:nbn:de:0030-drops-128303},
  doi =		{10.4230/LIPIcs.CONCUR.2020.18},
  annote =	{Keywords: Axiomatisation, Parallel composition, Linear time-branching time spectrum}
}
Document
Complete Volume
LIPIcs, Volume 140, CONCUR'19, Complete Volume

Authors: Wan Fokkink and Rob van Glabbeek

Published in: LIPIcs, Volume 140, 30th International Conference on Concurrency Theory (CONCUR 2019)


Abstract
LIPIcs, Volume 140, CONCUR'19, Complete Volume

Cite as

30th International Conference on Concurrency Theory (CONCUR 2019). Leibniz International Proceedings in Informatics (LIPIcs), Volume 140, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2019)


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@Proceedings{fokkink_et_al:LIPIcs.CONCUR.2019,
  title =	{{LIPIcs, Volume 140, CONCUR'19, Complete Volume}},
  booktitle =	{30th International Conference on Concurrency Theory (CONCUR 2019)},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-121-4},
  ISSN =	{1868-8969},
  year =	{2019},
  volume =	{140},
  editor =	{Fokkink, Wan and van Glabbeek, Rob},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/LIPIcs.CONCUR.2019},
  URN =		{urn:nbn:de:0030-drops-112105},
  doi =		{10.4230/LIPIcs.CONCUR.2019},
  annote =	{Keywords: Theory of computation, Concurrency}
}
Document
Front Matter
Front Matter, Table of Contents, Preface, Conference Organization

Authors: Wan Fokkink and Rob van Glabbeek

Published in: LIPIcs, Volume 140, 30th International Conference on Concurrency Theory (CONCUR 2019)


Abstract
Front Matter, Table of Contents, Preface, Conference Organization

Cite as

30th International Conference on Concurrency Theory (CONCUR 2019). Leibniz International Proceedings in Informatics (LIPIcs), Volume 140, pp. 0:i-0:xiv, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2019)


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@InProceedings{fokkink_et_al:LIPIcs.CONCUR.2019.0,
  author =	{Fokkink, Wan and van Glabbeek, Rob},
  title =	{{Front Matter, Table of Contents, Preface, Conference Organization}},
  booktitle =	{30th International Conference on Concurrency Theory (CONCUR 2019)},
  pages =	{0:i--0:xiv},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-121-4},
  ISSN =	{1868-8969},
  year =	{2019},
  volume =	{140},
  editor =	{Fokkink, Wan and van Glabbeek, Rob},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/LIPIcs.CONCUR.2019.0},
  URN =		{urn:nbn:de:0030-drops-109026},
  doi =		{10.4230/LIPIcs.CONCUR.2019.0},
  annote =	{Keywords: Front Matter, Table of Contents, Preface, Conference Organization}
}
Document
Invited Paper
Safety Verification for Deep Neural Networks with Provable Guarantees (Invited Paper)

Authors: Marta Z. Kwiatkowska

Published in: LIPIcs, Volume 140, 30th International Conference on Concurrency Theory (CONCUR 2019)


Abstract
Computing systems are becoming ever more complex, increasingly often incorporating deep learning components. Since deep learning is unstable with respect to adversarial perturbations, there is a need for rigorous software development methodologies that encompass machine learning. This paper describes progress with developing automated verification techniques for deep neural networks to ensure safety and robustness of their decisions with respect to input perturbations. This includes novel algorithms based on feature-guided search, games, global optimisation and Bayesian methods.

Cite as

Marta Z. Kwiatkowska. Safety Verification for Deep Neural Networks with Provable Guarantees (Invited Paper). In 30th International Conference on Concurrency Theory (CONCUR 2019). Leibniz International Proceedings in Informatics (LIPIcs), Volume 140, pp. 1:1-1:5, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2019)


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@InProceedings{kwiatkowska:LIPIcs.CONCUR.2019.1,
  author =	{Kwiatkowska, Marta Z.},
  title =	{{Safety Verification for Deep Neural Networks with Provable Guarantees}},
  booktitle =	{30th International Conference on Concurrency Theory (CONCUR 2019)},
  pages =	{1:1--1:5},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-121-4},
  ISSN =	{1868-8969},
  year =	{2019},
  volume =	{140},
  editor =	{Fokkink, Wan and van Glabbeek, Rob},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/LIPIcs.CONCUR.2019.1},
  URN =		{urn:nbn:de:0030-drops-109036},
  doi =		{10.4230/LIPIcs.CONCUR.2019.1},
  annote =	{Keywords: Neural networks, robustness, formal verification, Bayesian neural networks}
}
Document
Invited Paper
Synthesis of Safe, Optimal and Compact Strategies for Stochastic Hybrid Games (Invited Paper)

Authors: Kim G. Larsen

Published in: LIPIcs, Volume 140, 30th International Conference on Concurrency Theory (CONCUR 2019)


Abstract
UPPAAL-Stratego is a recent branch of the verification tool UPPAAL allowing for synthesis of safe and optimal strategies for stochastic timed (hybrid) games. We describe newly developed learning methods, allowing for synthesis of significantly better strategies and with much improved convergence behaviour. Also, we describe novel use of decision trees for learning orders-of-magnitude more compact strategy representation. In both cases, the seek for optimality does not compromise safety.

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Kim G. Larsen. Synthesis of Safe, Optimal and Compact Strategies for Stochastic Hybrid Games (Invited Paper). In 30th International Conference on Concurrency Theory (CONCUR 2019). Leibniz International Proceedings in Informatics (LIPIcs), Volume 140, pp. 2:1-2:5, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2019)


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@InProceedings{larsen:LIPIcs.CONCUR.2019.2,
  author =	{Larsen, Kim G.},
  title =	{{Synthesis of Safe, Optimal and Compact Strategies for Stochastic Hybrid Games}},
  booktitle =	{30th International Conference on Concurrency Theory (CONCUR 2019)},
  pages =	{2:1--2:5},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-121-4},
  ISSN =	{1868-8969},
  year =	{2019},
  volume =	{140},
  editor =	{Fokkink, Wan and van Glabbeek, Rob},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/LIPIcs.CONCUR.2019.2},
  URN =		{urn:nbn:de:0030-drops-109048},
  doi =		{10.4230/LIPIcs.CONCUR.2019.2},
  annote =	{Keywords: Timed automata, Stochastic hybrid grame, Symbolic synthesis, Reinforcement learning, Q-learning, M-learning}
}
Document
Invited Talk
Program Invariants (Invited Talk)

Authors: Joël Ouaknine

Published in: LIPIcs, Volume 140, 30th International Conference on Concurrency Theory (CONCUR 2019)


Abstract
Automated invariant generation is a fundamental challenge in program analysis and verification, going back many decades, and remains a topic of active research. In this talk I'll present a select overview and survey of work on this problem, and discuss unexpected connections to other fields including algebraic geometry, group theory, and quantum computing. (No previous knowledge of these topics will be assumed.) This is joint work with Ehud Hrushovski, Amaury Pouly, and James Worrell.

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Joël Ouaknine. Program Invariants (Invited Talk). In 30th International Conference on Concurrency Theory (CONCUR 2019). Leibniz International Proceedings in Informatics (LIPIcs), Volume 140, p. 3:1, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2019)


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@InProceedings{ouaknine:LIPIcs.CONCUR.2019.3,
  author =	{Ouaknine, Jo\"{e}l},
  title =	{{Program Invariants}},
  booktitle =	{30th International Conference on Concurrency Theory (CONCUR 2019)},
  pages =	{3:1--3:1},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-121-4},
  ISSN =	{1868-8969},
  year =	{2019},
  volume =	{140},
  editor =	{Fokkink, Wan and van Glabbeek, Rob},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/LIPIcs.CONCUR.2019.3},
  URN =		{urn:nbn:de:0030-drops-109056},
  doi =		{10.4230/LIPIcs.CONCUR.2019.3},
  annote =	{Keywords: Automated invariant generation, program analysis and verification}
}
Document
Invited Talk
Concurrent Algorithms and Data Structures for Model Checking (Invited Talk)

Authors: Jaco van de Pol

Published in: LIPIcs, Volume 140, 30th International Conference on Concurrency Theory (CONCUR 2019)


Abstract
Model checking is a successful method for checking properties on the state space of concurrent, reactive systems. Since it is based on exhaustive search, scaling this method to industrial systems has been a challenge since its conception. Research has focused on clever data structures and algorithms, to reduce the size of the state space or its representation; smart search heuristics, to reveal potential bugs and counterexamples early; and high-performance computing, to deploy the brute force processing power of clusters of compute-servers. The main challenge is to combine these approaches - brute-force alone (when implemented carefully) can bring a linear speedup in the number of processors. This is great, since it reduces model-checking times from days to minutes. On the other hand, proper algorithms and data structures can lead to exponential gains. Therefore, the parallelization bonus is only real if we manage to speedup clever algorithms. There are some obstacles though: many linear-time graph algorithms depend on a depth-first exploration order, which is hard to parallelize. Examples include the detection of strongly connected components (SCC) and the nested depth-first-search (NDFS) algorithm. Both are used in model checking LTL properties. Symbolic representations, like binary decision diagrams (BDDs), reduce model checking to "pointer-chasing", leading to irregular memory-access patterns. This poses severe challenges on achieving actual speedup in (clusters of) modern multi-core computer architectures. This talk presents some of the solutions found over the last 10 years, which led to the high-performance model checker LTSmin [Gijs Kant et al., 2015]. These include parallel NDFS (based on the PhD thesis of Alfons Laarman [Alfons Laarman, 2014]), the parallel detection of SCCs with concurrent Union-Find (based on the PhD thesis of Vincent Bloemen [Vincent Bloemen, 2019]), and concurrent BDDs (based on the PhD thesis of Tom van Dijk [Tom van Dijk, 2016]). Finally, I will sketch a perspective on moving forward from high-performance model checking to high-performance synthesis algorithms. Examples include parameter synthesis for stochastic and timed systems, and strategy synthesis for (stochastic and timed) games.

Cite as

Jaco van de Pol. Concurrent Algorithms and Data Structures for Model Checking (Invited Talk). In 30th International Conference on Concurrency Theory (CONCUR 2019). Leibniz International Proceedings in Informatics (LIPIcs), Volume 140, p. 4:1, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2019)


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@InProceedings{vandepol:LIPIcs.CONCUR.2019.4,
  author =	{van de Pol, Jaco},
  title =	{{Concurrent Algorithms and Data Structures for Model Checking}},
  booktitle =	{30th International Conference on Concurrency Theory (CONCUR 2019)},
  pages =	{4:1--4:1},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-121-4},
  ISSN =	{1868-8969},
  year =	{2019},
  volume =	{140},
  editor =	{Fokkink, Wan and van Glabbeek, Rob},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/LIPIcs.CONCUR.2019.4},
  URN =		{urn:nbn:de:0030-drops-109066},
  doi =		{10.4230/LIPIcs.CONCUR.2019.4},
  annote =	{Keywords: model checking, parallel algorithms, concurrent datastructures}
}
Document
Of Cores: A Partial-Exploration Framework for Markov Decision Processes

Authors: Jan Křetínský and Tobias Meggendorfer

Published in: LIPIcs, Volume 140, 30th International Conference on Concurrency Theory (CONCUR 2019)


Abstract
We introduce a framework for approximate analysis of Markov decision processes (MDP) with bounded-, unbounded-, and infinite-horizon properties. The main idea is to identify a "core" of an MDP, i.e., a subsystem where we provably remain with high probability, and to avoid computation on the less relevant rest of the state space. Although we identify the core using simulations and statistical techniques, it allows for rigorous error bounds in the analysis. Consequently, we obtain efficient analysis algorithms based on partial exploration for various settings, including the challenging case of strongly connected systems.

Cite as

Jan Křetínský and Tobias Meggendorfer. Of Cores: A Partial-Exploration Framework for Markov Decision Processes. In 30th International Conference on Concurrency Theory (CONCUR 2019). Leibniz International Proceedings in Informatics (LIPIcs), Volume 140, pp. 5:1-5:17, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2019)


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@InProceedings{kretinsky_et_al:LIPIcs.CONCUR.2019.5,
  author =	{K\v{r}et{\'\i}nsk\'{y}, Jan and Meggendorfer, Tobias},
  title =	{{Of Cores: A Partial-Exploration Framework for Markov Decision Processes}},
  booktitle =	{30th International Conference on Concurrency Theory (CONCUR 2019)},
  pages =	{5:1--5:17},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-121-4},
  ISSN =	{1868-8969},
  year =	{2019},
  volume =	{140},
  editor =	{Fokkink, Wan and van Glabbeek, Rob},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/LIPIcs.CONCUR.2019.5},
  URN =		{urn:nbn:de:0030-drops-109076},
  doi =		{10.4230/LIPIcs.CONCUR.2019.5},
  annote =	{Keywords: Markov Decision Processes, Reachability, Approximation}
}
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