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A brief history of process algebra
 Theor. Comput. Sci
, 2004
"... Abstract. This note addresses the history of process algebra as an area of research in concurrency theory, the theory of parallel and distributed systems in computer science. Origins are traced back to the early seventies of the twentieth century, and developments since that time are sketched. The a ..."
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Cited by 82 (1 self)
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Abstract. This note addresses the history of process algebra as an area of research in concurrency theory, the theory of parallel and distributed systems in computer science. Origins are traced back to the early seventies of the twentieth century, and developments since that time are sketched. The author gives his personal views on these matters. He also considers the present situation, and states some challenges for the future.
Practical Foundations for Programming Languages
 In Dynamic Languages Symposium (DLS
, 2007
"... Types are the central organizing principle of the theory of programming languages. Language features are manifestations of type structure. The syntax of a language is governed by the constructs that define its types, and its semantics is determined by the interactions among those constructs. The sou ..."
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Cited by 35 (7 self)
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Types are the central organizing principle of the theory of programming languages. Language features are manifestations of type structure. The syntax of a language is governed by the constructs that define its types, and its semantics is determined by the interactions among those constructs. The soundness of a language design—the absence of illdefined programs— follows naturally. The purpose of this book is to explain this remark. A variety of programming language features are analyzed in the unifying framework of type theory. A language feature is defined by its statics, the rules governing the use of the feature in a program, and its dynamics, the rules defining how programs using this feature are to be executed. The concept of safety emerges as the coherence of the statics and the dynamics of a language. In this way we establish a foundation for the study of programming languages. But why these particular methods? Though it would require a book in itself to substantiate this assertion, the typetheoretic approach
A structural proof of the soundness of rely/guarantee rules
 Journal of Logic and Computation
, 2007
"... Abstract. Various forms of rely/guarantee conditions have been used to record and reason about interference in ways that provide compositional development methods for concurrent programs. This paper illustrates such a set of rules and proves their soundness. The underlying concurrent language allows ..."
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Abstract. Various forms of rely/guarantee conditions have been used to record and reason about interference in ways that provide compositional development methods for concurrent programs. This paper illustrates such a set of rules and proves their soundness. The underlying concurrent language allows finegrained interleaving and nested concurrency; it is defined by an operational semantics; the proof that the rely/guarantee rules are consistent with that semantics (including termination) is by a structural induction. A key lemma which relates the states which can arise from the extra interference that results from taking a portion of the program out of context makes it possible to do the proofs without having to perform induction over the computation history. This lemma also offers a way to think about expressibility issues around auxiliary variables in rely/guarantee conditions. 1
From reductionbased to reductionfree normalization
 Proceedings of the Fourth International Workshop on Reduction Strategies in Rewriting and Programming (WRS'04
, 2004
"... We document an operational method to construct reductionfree normalization functions. Starting from a reductionbased normalization function from a reduction semantics, i.e., the iteration of a onestep reduction function, we successively subject it to refocusing (i.e., deforestation of the inte ..."
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Cited by 28 (13 self)
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We document an operational method to construct reductionfree normalization functions. Starting from a reductionbased normalization function from a reduction semantics, i.e., the iteration of a onestep reduction function, we successively subject it to refocusing (i.e., deforestation of the intermediate successive terms in the reduction sequence), equational simplication, refunctionalization (i.e., the converse of defunctionalization), and directstyle transformation (i.e., the converse of the CPS transformation), ending with a reductionfree normalization function of the kind usually crafted by hand. We treat in detail four simple examples: calculating arithmetic expressions, recognizing Dyck words, normalizing lambdaterms with explicit substitutions and call/cc, and attening binary trees. The overall method builds on previous work by the author and his students on a syntactic correspondence between reduction semantics and abstract machines and on a functional correspondence between evaluators and abstract machines. The measure of success of these two correspondences is that each of the interderived semantic artifacts (i.e., manmade constructs) could plausibly have been written by hand, as is the actual case for several ones derived here.
Towards an Algebra of Actors
, 1996
"... We present a study of the interaction properties of objects in concurrent object oriented programming. We identify a set of basic interaction mechanisms: object identity, asynchronous message passing, implicit receive primitive, which are closed to those of the actor model. Then, we define a minimal ..."
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Cited by 14 (6 self)
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We present a study of the interaction properties of objects in concurrent object oriented programming. We identify a set of basic interaction mechanisms: object identity, asynchronous message passing, implicit receive primitive, which are closed to those of the actor model. Then, we define a minimal algebra of actors as a basic formalism for representing the semantics of concurrent object oriented programming. Finally, we define a notion of observation equivalence between the actor terms of the algebra which has been proved to be a congruence with respect to the parallel composition operator.
A Logical and Computational Theory of Located Resource
, 2008
"... Experience of practical systems modelling suggests that the key conceptual components of a model of a system are processes, resources, locations, and environment. In recent work, we have given a processtheoretic account of this view in which resources as well as processes are firstclass citizens. ..."
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Cited by 14 (10 self)
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Experience of practical systems modelling suggests that the key conceptual components of a model of a system are processes, resources, locations, and environment. In recent work, we have given a processtheoretic account of this view in which resources as well as processes are firstclass citizens. This process calculus, SCRP, captures the structural aspects of the semantics of the Demos2k modelling tool. Demos2k represents environment stochastically using a wide range of probability distributions and queuelike data structures. Associated with SCRP is a (bunched) modal logic, MBI, which combines the usual additive connectives of HennessyMilner logic with their multiplicative counterparts. In this paper, we complete our conceptual framework by adding to SCRP and MBI an account of a notion of location that is simple, yet sufficiently expressive to capture naturally a wide range of forms of location, both spatial and logical. We also provide a description of an extension of the Demos2k tool to incorporate this notion of location. 1
SOS formats and metatheory: 20 years after
, 2007
"... In 1981 Structural Operational Semantics (SOS) was introduced as a systematic way to define operational semantics of programming languages by a set of rules of a certain shape [G.D. Plotkin, A structural approach to operational semantics, Technical ..."
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Cited by 14 (5 self)
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In 1981 Structural Operational Semantics (SOS) was introduced as a systematic way to define operational semantics of programming languages by a set of rules of a certain shape [G.D. Plotkin, A structural approach to operational semantics, Technical
From Bialgebraic Semantics to Congruence Formats
, 2005
"... A general and abstract framework to defining congruence formats for various process equivalences coalgebraic approach to process equivalence, based on a notion of test suite. The resulting technique is illustrated on the example of completed trace equivalence. Rather than providing formal proofs, th ..."
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Cited by 11 (4 self)
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A general and abstract framework to defining congruence formats for various process equivalences coalgebraic approach to process equivalence, based on a notion of test suite. The resulting technique is illustrated on the example of completed trace equivalence. Rather than providing formal proofs, the paper is guiding the reader through the process of deriving a congruence format in the test suite approach.
ProofChecking Protocols using Bisimulations
 IN PROC. CONCUR’99, LNCS 1664
, 1999
"... We report on our experience in using the Isabelle/HOL theorem prover to mechanize proofs of observation equivalence for systems with infinitely many states, and for parameterized systems. We follow the direct approach: An infinite relation containing the pair of systems to be shown equivalent is def ..."
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Cited by 11 (2 self)
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We report on our experience in using the Isabelle/HOL theorem prover to mechanize proofs of observation equivalence for systems with infinitely many states, and for parameterized systems. We follow the direct approach: An infinite relation containing the pair of systems to be shown equivalent is defined, and then proved to be a weak bisimulation. The weak bisimilarity proof is split into many cases, corresponding to the derivatives of the pairs in the relation. Isabelle/HOL automatically proves simple cases, and guarantees that no case is forgotten. The strengths and weaknesses of the approach are discussed.
Structural operational semantics of P Systems
 in: Proceedings of the 6th Workshop on Membrane Computing, WMC 2005, in Lecture Notes in Computer Science
, 2006
"... Abstract. The paper formally describes an operational semantics of P systems. We present an abstract syntax of P systems, then the notion of congurations, and we dene the sets of inference rules corresponding to the three stages of an evolution step: maximal parallel rewriting, parallel communicatio ..."
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Cited by 9 (1 self)
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Abstract. The paper formally describes an operational semantics of P systems. We present an abstract syntax of P systems, then the notion of congurations, and we dene the sets of inference rules corresponding to the three stages of an evolution step: maximal parallel rewriting, parallel communication, and parallel dissolving. Several results assuring the correctness of each set of inference rules are also presented. Finally, we dene simulation and bisimulation relations between P systems. 1