5 Search Results for "Ghilardi, Silvio"


Document
Uniform Interpolation for Coalgebraic Fixpoint Logic

Authors: Johannes Marti, Fatemeh Seifan, and Yde Venema

Published in: LIPIcs, Volume 35, 6th Conference on Algebra and Coalgebra in Computer Science (CALCO 2015)


Abstract
We use the connection between automata and logic to prove that a wide class of coalgebraic fixpoint logics enjoys uniform interpolation. To this aim, first we generalize one of the central results in coalgebraic automata theory, namely closure under projection, which is known to hold for weak-pullback preserving functors, to a more general class of functors, i.e., functors with quasifunctorial lax extensions. Then we will show that closure under projection implies definability of the bisimulation quantifier in the language of coalgebraic fixpoint logic, and finally we prove the uniform interpolation theorem.

Cite as

Johannes Marti, Fatemeh Seifan, and Yde Venema. Uniform Interpolation for Coalgebraic Fixpoint Logic. In 6th Conference on Algebra and Coalgebra in Computer Science (CALCO 2015). Leibniz International Proceedings in Informatics (LIPIcs), Volume 35, pp. 238-252, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2015)


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@InProceedings{marti_et_al:LIPIcs.CALCO.2015.238,
  author =	{Marti, Johannes and Seifan, Fatemeh and Venema, Yde},
  title =	{{Uniform Interpolation for Coalgebraic Fixpoint Logic}},
  booktitle =	{6th Conference on Algebra and Coalgebra in Computer Science (CALCO 2015)},
  pages =	{238--252},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-939897-84-2},
  ISSN =	{1868-8969},
  year =	{2015},
  volume =	{35},
  editor =	{Moss, Lawrence S. and Sobocinski, Pawel},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.CALCO.2015.238},
  URN =		{urn:nbn:de:0030-drops-55379},
  doi =		{10.4230/LIPIcs.CALCO.2015.238},
  annote =	{Keywords: mu-calculus, uniform interpolation, coalgebra, automata}
}
Document
Generic Trace Semantics and Graded Monads

Authors: Stefan Milius, Dirk Pattinson, and Lutz Schröder

Published in: LIPIcs, Volume 35, 6th Conference on Algebra and Coalgebra in Computer Science (CALCO 2015)


Abstract
Models of concurrent systems employ a wide variety of semantics inducing various notions of process equivalence, ranging from linear-time semantics such as trace equivalence to branching-time semantics such as strong bisimilarity. Many of these generalize to system types beyond standard transition systems, featuring, for example, weighted, probabilistic, or game-based transitions; this motivates the search for suitable coalgebraic abstractions of process equivalence that cover these orthogonal dimensions of generality, i.e. are generic both in the system type and in the notion of system equivalence. In recent joint work with Kurz, we have proposed a parametrization of system equivalence over an embedding of the coalgebraic type functor into a monad. In the present paper, we refine this abstraction to use graded monads, which come with a notion of depth that corresponds, e.g., to trace length or bisimulation depth. We introduce a notion of graded algebras and show how they play the role of formulas in trace logics.

Cite as

Stefan Milius, Dirk Pattinson, and Lutz Schröder. Generic Trace Semantics and Graded Monads. In 6th Conference on Algebra and Coalgebra in Computer Science (CALCO 2015). Leibniz International Proceedings in Informatics (LIPIcs), Volume 35, pp. 253-269, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2015)


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@InProceedings{milius_et_al:LIPIcs.CALCO.2015.253,
  author =	{Milius, Stefan and Pattinson, Dirk and Schr\"{o}der, Lutz},
  title =	{{Generic Trace Semantics and Graded Monads}},
  booktitle =	{6th Conference on Algebra and Coalgebra in Computer Science (CALCO 2015)},
  pages =	{253--269},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-939897-84-2},
  ISSN =	{1868-8969},
  year =	{2015},
  volume =	{35},
  editor =	{Moss, Lawrence S. and Sobocinski, Pawel},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.CALCO.2015.253},
  URN =		{urn:nbn:de:0030-drops-55389},
  doi =		{10.4230/LIPIcs.CALCO.2015.253},
  annote =	{Keywords: transition systems, monads, coalgebra, trace logics}
}
Document
Dismatching and Local Disunification in EL

Authors: Franz Baader, Stefan Borgwardt, and Barbara Morawska

Published in: LIPIcs, Volume 36, 26th International Conference on Rewriting Techniques and Applications (RTA 2015)


Abstract
Unification in Description Logics has been introduced as a means to detect redundancies in ontologies. We try to extend the known decidability results for unification in the Description Logic EL to disunification since negative constraints on unifiers can be used to avoid unwanted unifiers. While decidability of the solvability of general EL-disunification problems remains an open problem, we obtain NP-completeness results for two interesting special cases: dismatching problems, where one side of each negative constraint must be ground, and local solvability of disunification problems, where we restrict the attention to solutions that are built from so-called atoms occurring in the input problem. More precisely, we first show that dismatching can be reduced to local disunification, and then provide two complementary NP-algorithms for finding local solutions of (general) disunification problems.

Cite as

Franz Baader, Stefan Borgwardt, and Barbara Morawska. Dismatching and Local Disunification in EL. In 26th International Conference on Rewriting Techniques and Applications (RTA 2015). Leibniz International Proceedings in Informatics (LIPIcs), Volume 36, pp. 40-56, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2015)


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@InProceedings{baader_et_al:LIPIcs.RTA.2015.40,
  author =	{Baader, Franz and Borgwardt, Stefan and Morawska, Barbara},
  title =	{{Dismatching and Local Disunification in EL}},
  booktitle =	{26th International Conference on Rewriting Techniques and Applications (RTA 2015)},
  pages =	{40--56},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-939897-85-9},
  ISSN =	{1868-8969},
  year =	{2015},
  volume =	{36},
  editor =	{Fern\'{a}ndez, Maribel},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.RTA.2015.40},
  URN =		{urn:nbn:de:0030-drops-51884},
  doi =		{10.4230/LIPIcs.RTA.2015.40},
  annote =	{Keywords: Unification, Description Logics, SAT}
}
Document
Rewriting-based Quantifier-free Interpolation for a Theory of Arrays

Authors: Roberto Bruttomesso, Silvio Ghilardi, and Silvio Ranise

Published in: LIPIcs, Volume 10, 22nd International Conference on Rewriting Techniques and Applications (RTA'11) (2011)


Abstract
The use of interpolants in model checking is becoming an enabling technology to allow fast and robust verification of hardware and software. The application of encodings based on the theory of arrays, however, is limited by the impossibility of deriving quantifier-free interpolants in general. In this paper, we show that, with a minor extension to the theory of arrays, it is possible to obtain quantifier-free interpolants. We prove this by designing an interpolating procedure, based on solving equations between array updates. Rewriting techniques are used in the key steps of the solver and its proof of correctness. To the best of our knowledge, this is the first successful attempt of computing quantifier-free interpolants for a theory of arrays.

Cite as

Roberto Bruttomesso, Silvio Ghilardi, and Silvio Ranise. Rewriting-based Quantifier-free Interpolation for a Theory of Arrays. In 22nd International Conference on Rewriting Techniques and Applications (RTA'11). Leibniz International Proceedings in Informatics (LIPIcs), Volume 10, pp. 171-186, Schloss Dagstuhl - Leibniz-Zentrum für Informatik (2011)


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@InProceedings{bruttomesso_et_al:LIPIcs.RTA.2011.171,
  author =	{Bruttomesso, Roberto and Ghilardi, Silvio and Ranise, Silvio},
  title =	{{Rewriting-based Quantifier-free Interpolation for a Theory of Arrays}},
  booktitle =	{22nd International Conference on Rewriting Techniques and Applications (RTA'11)},
  pages =	{171--186},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-939897-30-9},
  ISSN =	{1868-8969},
  year =	{2011},
  volume =	{10},
  editor =	{Schmidt-Schauss, Manfred},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.RTA.2011.171},
  URN =		{urn:nbn:de:0030-drops-31155},
  doi =		{10.4230/LIPIcs.RTA.2011.171},
  annote =	{Keywords: rewriting, interpolation, arrays, model-checking}
}
Document
From Non-Disjoint Combination to Satisfiability and Model-Checking of Infinite State Systems

Authors: Silvio Ghilardi, Silvio Ranise, Enrica Nicolini, and Daniele Zucchelli

Published in: Dagstuhl Seminar Proceedings, Volume 7401, Deduction and Decision Procedures (2007)


Abstract
In the first part of our contribution, we review recent results on combined constraint satisfiability for first order theories in the non-disjoint signatures case: this is done mainly in view of the applications to temporal satisfiability and model-checking covered by the second part of our talk, but we also illustrate in more detail some case-study where non-disjoint combination arises. The first case deals with extensions of the theory of arrays where indexes are endowed with a Presburger arithmetic structure and a length expressing `dimension' is added; the second case deals with the algebraic counterparts of fusion in modal logics. We then recall the basic features of the Nelson-Oppen method and investigate sufficient conditions for it to be complete and terminating in the non-disjoint signatures case: for completeness we rely on a model-theoretic $T_0$-compatibility condition (generalizing stable infiniteness) and for termination we impose a noetherianity requirement on positive constraints chains. We finally supply examples of theories matching these combinability hypotheses. In the second part of our contribution, we develop a framework for integrating first-order logic (FOL) and discrete Linear time Temporal Logic (LTL). Manna and Pnueli have extensively shown how a mixture of FOL and LTL is sufficient to precisely state verification problems for the class of reactive systems: theories in FOL model the (possibly infinite) data structures used by a reactive system while LTL specifies its (dynamic) behavior. Our framework for the integration is the following: we fix a theory $T$ in a first-order signature $Sigma$ and consider as a temporal model a sequence $cM_1, cM_2, dots$ of standard (first-order) models of $T$ and assume such models to share the same carrier (or, equivalently, the domain of the temporal model to be `constant'). Following Plaisted, we consider symbols from a subsignature $Sigma_r$ of $Sigma$ to be emph{rigid}, i.e. in a temporal model $cM_1, cM_2, dots$, the $Sigma_r$-restrictions of the $cM_i$'s must coincide. The symbols in $Sigmasetminus Sigma_r$ are called `flexible' and their interpretation is allowed to change over time (free variables are similarly divided into `rigid' and `flexible'). For model-checking, the emph{initial states} and the emph{transition relation} are represented by first-order formulae, whose role is that of (non-deterministically) restricting the temporal evolution of the model. In the quantifier-free case, we obtain sufficient conditions for %undecidability and decidability for both satisfiability and model-checking of safety properties emph{by lifting combination methods} for emph{non-disjoint} theories in FOL: noetherianity and $T_0$-compatibility (where $T_0$ is the theory axiomatizing the rigid subtheory) gives decidability of satisfiability, whereas $T_0$-compatibility and local finiteness give safety model-checking decidability. The proofs of these decidability results suggest how decision procedures for the constraint satisfiability problem of theories in FOL and algorithms for checking the satisfiability of propositional LTL formulae can be integrated. This paves the way to employ efficient Satisfiability Modulo Theories solvers in the model-checking of infinite state systems. We illustrate our techniques on some examples and discuss further work in the area.

Cite as

Silvio Ghilardi, Silvio Ranise, Enrica Nicolini, and Daniele Zucchelli. From Non-Disjoint Combination to Satisfiability and Model-Checking of Infinite State Systems. In Deduction and Decision Procedures. Dagstuhl Seminar Proceedings, Volume 7401, pp. 1-2, Schloss Dagstuhl - Leibniz-Zentrum für Informatik (2007)


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@InProceedings{ghilardi_et_al:DagSemProc.07401.4,
  author =	{Ghilardi, Silvio and Ranise, Silvio and Nicolini, Enrica and Zucchelli, Daniele},
  title =	{{From Non-Disjoint Combination to Satisfiability and Model-Checking of Infinite State Systems}},
  booktitle =	{Deduction and Decision Procedures},
  pages =	{1--2},
  series =	{Dagstuhl Seminar Proceedings (DagSemProc)},
  ISSN =	{1862-4405},
  year =	{2007},
  volume =	{7401},
  editor =	{Franz Baader and Byron Cook and J\"{u}rgen Giesl and Robert Nieuwenhuis},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagSemProc.07401.4},
  URN =		{urn:nbn:de:0030-drops-12479},
  doi =		{10.4230/DagSemProc.07401.4},
  annote =	{Keywords: Non disjoint combination, linear temporal logic, model checking}
}
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