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检索条件"任意字段=17th International Symposium on Logic-Based Program Synthesis and Transformation"

共 160 条记录，以下是91-100 订阅

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Equational Formulas and Pattern Operations in Initial Order-Sorted Algebras 25th

Equational Formulas and Pattern Operations in Initial Order-...

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25th international symposium on logic-based program synthesis and transformation (LOPSTR)

作者： Meseguer, Jose Skeirik, Stephen Univ Illinois Dept Comp Sci Champaign IL 61820 USA

ISBN: (纸本)9783319274362;9783319274355

A pattern t, i.e., a term possibly with variables, denotes the set (language) [t] of all its ground instances. In an untyped setting, symbolic operations on finite sets of patterns can represent Boolean operations on languages. But for the more expressive patterns needed in declarative languages supporting rich type disciplines such as subtype polymorphism untyped pattern operations and algorithms break down. We show how they can be properly defined by means of a signature transformation Sigma bar right arrow Sigma(#) that enriches the types of S. We also show that this transformation allows a systematic reduction of the first-order logic properties of an initial order-sorted algebra supporting subtype-polymorphic functions to equivalent properties of an initial many-sorted (i.e., simply typed) algebra. this yields a new, simple proof of the known decidability of the first-order theory of an initial order-sorted algebra.

关键词： Pattern operations Initial decidability Order-Sorted logic

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program Specialization for Verifying Infinite State Systems: An Experimental Evaluation

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20th international symposium on logic-based program synthesis and transformation, LOPSTR 2010

作者： Fioravanti, Fabio Pettorossi, Alberto Proietti, Maurizio Senni, Valerio Univ G D Annunzio Dipartimento Sci Pescara Italy Univ Roma Tor Vergata DISP Rome Italy CNR IASI Rome Italy

ISBN: (纸本)9783642205507

We address the problem of the automated verification of temporal properties of infinite state reactive systems. We present some improvements of a verification method based on the specialization of constraint logic programs (CLP). First, we reformulate the verification method as a two-phase procedure: (1) in the first phase a CLP specification of an infinite state system is specialized with respect to the initial state of the system and the temporal property to be verified, and (2) in the second phase the specialized program is evaluated by using a bottom-up strategy. In this paper we propose some new strategies for performing program specialization during the first phase. We evaluate the effectiveness of these new strategies, as well as that of some old strategies, by presenting the results of experiments performed on several infinite state systems and temporal properties. Finally, we compare the implementation of our specialization-based verification method with various constraint-based model checking tools. the experimental results show that our method is effective and competitive with respect to the methods used in those other tools.

关键词： logic programming

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Eliminating Unstable Tests in Floating-Point programs 28th

Eliminating Unstable Tests in Floating-Point Programs

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28th international symposium on logic-based program synthesis and transformation (LOPSTR(

作者： Titolo, Laura Munoz, Cesar A. Feliu, Marco A. Moscato, Mariano M. Natl Inst Aerosp Hampton VA 23666 USA NASA Langley Res Ctr Hampton VA 23665 USA

ISBN: (纸本)9783030138387;9783030138370

Round-off errors arising from the difference between real numbers and their floating-point representation cause the control flow of conditional floating-point statements to deviate from the ideal flow of the real-number computation. this problem, which is called test instability, may result in a significant difference between the computation of a floating-point program and the expected output in real arithmetic. In this paper, a formally proven program transformation is proposed to detect and correct the effects of unstable tests. the output of this transformation is a floating-point program that is guaranteed to return either the result of the original floating-point program when it can be assured that both its real and its floating-point flows agree or a warning when these flows may diverge. the proposed approach is illustrated with the transformation of the core computation of a polygon containment algorithm developed at NASA that is used in a geofencing system for unmanned aircraft systems.

关键词： Floating-point numbers Round-off error program transformation Test instability Formal verification

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Binary Implication Hypergraphs for the Representation and Simplification of Propositional Formulae 34th

Binary Implication Hypergraphs for the Representation and Si...

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34th international symposium on logic-based program synthesis and transformation (LOPSTR)

作者： de Mas, Jordina Frances Univ St Andrews Sch Comp Sci St Andrews Fife Scotland

ISBN: (纸本)9783031712937;9783031712944

Propositional simplification and preprocessing are of key importance in the fields of automated reasoning and theorem proving. We present a novel propositional formula representation able to capture all of its n-ary implication information in a tractable manner. From the exploration of this novel encoding in the form of a directed hypergraph, we derive a novel simplification rule which is guaranteed to be equivalencepreserving, monotonically decreasing in the size of the problem, and capable of deep inference. We are not aware of any such generic preprocessing framework capable of systematically simplifying propositional problems in arbitrary form. Interestingly, our rule effectively generalises and streamlines most of the known equivalence-preserving SAT preprocessing techniques. Additionally, since our problem transformations are domain- and application-independent, they can be used in combination with any propositional-logic-based techniques, including those currently used in automated reasoning, solving and optimisation tools.

关键词： Knowledge representation Propositional logic simplification Hypergraphs Implication graphs Existential graphs

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synthesis of Modality Definitions and a theorem Prover for Epistemic Intuitionistic logic 30th

Synthesis of Modality Definitions and a Theorem Prover for E...

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30th international Conference on logic-based program synthesis and transformation (LOPSTR)

作者： Tarau, Paul Univ North Texas Dept Comp Sci & Engn Denton TX 76203 USA

ISBN: (纸本)9783030684457;9783030684464

We propose a mechanism for automating discovery of definitions, that, when added to a logic system for which we have a theorem prover, extends it to support an embedding of a new logic system into it. As a result, the synthesized definitions, when added to the prover, implement a prover for the new logic. As an instance of the proposed mechanism, we derive a Prolog theorem prover for an interesting but unconventional epistemic logic by starting from the sequent calculus G4IP that we extend with operator definitions to obtain an embedding in intuitionistic propositional logic (IPC). With help of a candidate definition formula generator, we discover epistemic operators for which axioms and theorems of Artemov and Protopopescu's Intuitionistic Epistemic logic (IEL) hold and formulas expected to be non-theorems fail. We compare the embedding of IEL in IPC with a similarly discovered successful embedding of Dosen's double negation modality, judged inadequate as an epistemic operator. Finally, we discuss the failure of the necessitation rule for an otherwise successful S4 embedding and share our thoughts about the intuitions explaining these differences between epistemic and alethic modalities in the context of the Brouwer-Heyting-Kolmogorov semantics of intuitionistic reasoning and knowledge acquisition.

关键词： Automatic synthesis of logic systems Deriving new theorem provers via program synthesis Epistemic intuitionistic logic Propositional intuitionistic logic Prolog-based theorem provers Embedding of modal logics into intuitionistic logic

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logic-based program synthesis and transformation 1

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丛书名： Lecture Notes in Computer Science

1000年

作者： Alicia Villanueva

ISBN: (数字)9783031167676

ISBN: (纸本)9783031167669

this book constitutes the refereed proceedings of the 32;international symposium on logic-based synthesis and transformation, LOPSTR 2022, which was held during September 21-23, 2022.;the 8 full papers were selected from 17 submissions and cover different aspects of logic-based program development, all stages of the software life cycle, and issues of both programming-in-the-small and programming-in-the-large.

关键词： logics and Meanings of programs

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9th international Workshop on logic-based program synthesis and transformation, LOPSTR 1999

9th International Workshop on Logic-Based Program Synthesis ...

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9th international Workshop on logic-based program synthesis and transformation, LOPSTR 1999

ISBN: (纸本)3540676287

the proceedings contain 17 papers. the special focus in this conference is on Invited Talk and Tutorials. the topics include: Algebraic specification and program development by stepwise refinement extended abstract;proof obligations of the b formal method;constraint logic programming applied to model checking;on dynamic aspects of OOD frameworks in component-based software development in computational logic;infinite state model checking by abstract interpretation and program specialisation;mode analysis domains for typed logic programs;imperative program specialisation;specialising finite domain programs using polyhedra;roles of program extension;transformation of left terminating programs;transformation rules for logic programs with goals as arguments;making mercury programs tail recursive;the replacement operation for CCP programs;annotations for prolog - a concept and runtime handling;verification by testing for recursive program schemes;combined static and dynamic assertion-based debugging of constraint logic programs and context-moving transformations for function verification.

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A Generic Intermediate Representation for Verification Condition Generation 25th

A Generic Intermediate Representation for Verification Condi...

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25th international symposium on logic-based program synthesis and transformation (LOPSTR)

作者： Montenegro, Manuel Pena, Ricardo Sanchez-Hernandez, Jaime Univ Complutense Madrid Madrid Spain

ISBN: (纸本)9783319274362;9783319274355

As part of a platform for computer-assisted verification, we present an intermediate representation of programs that is both language independent and appropriate for the generation of verification conditions. We show how many imperative and functional languages can be translated to this generic intermediate representation, and how the generated conditions reflect the axiomatic semantics of the original program. At this representation level, loop invariants and preconditions of recursive functions belonging to the original program are represented by assertions placed at certain edges of a directed graph. the paper defines the generic representation, sketches the transformation algorithms, and describes how the places where the invariants should be placed are computed. Assuming that, either manually or assisted by the platform, the invariants have been settled, it is shown how the verification conditions are generated. A running example illustrates the process.

关键词： Verification platforms Intermediate representation Verification conditions program transformation

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Liveness-Driven Random program Generation 27th

Liveness-Driven Random Program Generation

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27th international symposium on logic-based program synthesis and transformation (LOPSTR)

作者： Barany, Gergo INRIA Paris France

ISBN: (纸本)9783319944609;9783319944593

Randomly generated programs are popular for testing compilers and program analysis tools, with hundreds of bugs in real-world C compilers found by random testing. However, existing random program generators may generate large amounts of dead code (computations whose result is never used). this leaves relatively little code to exercise a target compiler's more complex optimizations. To address this shortcoming, we introduce liveness-driven random program generation. In this approach the random program is constructed bottom-up, guided by a simultaneous structural data-flow analysis to ensure that the generator never generates dead code. the algorithm is implemented as a plugin for the Frama-C framework. We evaluate it in comparison to Csmith, the standard random C program generator. Our tool generates programs that compile to more machine code with a more complex instruction mix.

关键词： Code generation Random testing Data-flow analysis program optimization

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Proving program Properties as First-Order Satisfiability 28th

Proving Program Properties as First-Order Satisfiability

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28th international symposium on logic-based program synthesis and transformation (LOPSTR(

作者： Lucas, Salvador Univ Politecn Valencia DSIC Valencia Spain

ISBN: (纸本)9783030138387;9783030138370

program semantics can often be expressed as a (many-sorted) first-order theory S, and program properties as sentences phi which are intended to hold in the canonical model of such a theory, which is often incomputable. Recently, we have shown that properties phi expressed as the existential closure of a boolean combination of atoms can be disproved by just finding a model of S and the negation (sic)phi of phi. Furthermore, this idea works quite well in practice due to the existence of powerful tools for the automatic generation of models for (many-sorted) first-order theories. In this paper we extend our previous results to arbitrary properties, expressed as sentences without any special restriction. Consequently, one can prove a program property. by just finding a model of an appropriate theory (including S and possibly something else) and an appropriate first-order formula related to.. Beyond its possible theoretical interest, we show that our results can also be of practical use in several respects.

关键词： First-order logic logical models program analysis

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