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Denotational Semantics Of The Actor Model
The denotational semantics of the Actor model is the subject of denotational domain theory for Actors. The historical development of this subject is recounted in ewitt 2008b Actor fixed point semantics The denotational theory of computational system semantics is concerned with finding mathematical objects that represent what systems do. Collections of such objects are called domains. The Actor uses the domain of event diagram scenarios. It is usual to assume some properties of the domain, such as the existence of limits of chains (see cpo) and a bottom element. Various additional properties are often reasonable and helpful: the article on domain theory has more details. A domain is typically a partial order, which can be understood as an order of definedness. For instance, given event diagram scenarios and , one might let "" mean that " extends the computations ". The mathematical denotation for a system is found by constructing increasingly better approximations from an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Denotational Semantics
In computer science, denotational semantics (initially known as mathematical semantics or Scott–Strachey semantics) is an approach of formalizing the meanings of programming languages by constructing mathematical objects (called ''denotations'') that describe the meanings of Expression (computer science), expressions from the languages. Other approaches providing formal semantics of programming languages include axiomatic semantics and operational semantics. Broadly speaking, denotational semantics is concerned with finding mathematical objects called domain theory, domains that represent what programs do. For example, programs (or program phrases) might be represented by partial functionsDana S. ScottOutline of a mathematical theory of computation Technical Monograph PRG-2, Oxford University Computing Laboratory, Oxford, England, November 1970.Dana Scott and Christopher Strachey. ''Toward a mathematical semantics for computer languages'' Oxford Programming Research Group Techn ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Actor Model Theory
In theoretical computer science, Actor model theory concerns theoretical issues for the Actor model. Actors are the primitives that form the basis of the Actor model of concurrent digital computation. In response to a message that it receives, an Actor can make local decisions, create more Actors, send more messages, and designate how to respond to the next message received. Actor model theory incorporates theories of the events and structures of Actor computations, their proof theory, and denotational semantics of the Actor model, denotational models. Events and their orderings From the definition of an Actor, it can be seen that numerous events take place: local decisions, creating Actors, sending messages, receiving messages, and designating how to respond to the next message received. However, this article focuses on just those events that are the arrival of a message sent to an Actor. This article reports on the results published in Hewitt [2006]. :''Law of Countability' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Carl Hewitt
Carl Eddie Hewitt (; 1944 – 7 December 2022)''Carl Hewitt'' Stanford. 2022. was an American computer scientist who designed the Planner programming language for Carl Hewitt ''PLANNER: A Language for Proving Theorems in Robots'' IJCAI. 1969. and the |
Krzysztof R
Krzysztof () is a Polish male given name, equivalent to English ''Christopher''. The name became popular in the 15th century. Its diminutive forms include Krzyś, Krzysiek, and Krzysio; augmentative – Krzychu Individuals named Krzysztof may choose to celebrate their name day on March 15, July 25, March 2, May 21, August 20 or October 31. People with the first name Krzysztof * Krzysztof Arciszewski (1592–1656), Polish military man * Krzysztof Bednarski (born 1953), famous contemporary Polish sculptor * Krzysztof Bizacki (born 1973), Polish footballer * Krzysztof Bukalski (born 1970), Polish footballer * Krzysztof Charamsa (born 1972), Polish priest * Krzysztof Chodkiewicz, d. 1652, Polish-Lithuanian nobleman * Krzysztof Cwalina (born 1971), Polish freestyle swimmer * Krzysztof Czerwinski (Krzysztof Czerwiński) (born 1980), Polish conductor, organist and voice teacher * Krzysztof Dabrowski (Krzysztof Dąbrowski) (born 1978), Polish footballer * Krzysztof Głowacki (bor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Prentice Hall
Prentice Hall was a major American publishing#Textbook_publishing, educational publisher. It published print and digital content for the 6–12 and higher-education market. It was an independent company throughout the bulk of the twentieth century. In its last few years it was owned by, then absorbed into, Savvas Learning Company. In the Web era, it distributed its technical titles through the Safari Books Online e-reference service for some years. History On October 13, 1913, law professor Charles Gerstenberg and his student Richard Ettinger founded Prentice Hall. Gerstenberg and Ettinger took their mothers' maiden names, Prentice and Hall, to name their new company. At the time the name was usually styled as Prentice-Hall (as seen for example on many title pages), per an orthographic norm for Dash#Relationships and connections, coordinate elements within such compounds (compare also ''McGraw-Hill'' with later styling as ''McGraw Hill''). Prentice-Hall became known as a publi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Edsger Dijkstra
Edsger Wybe Dijkstra ( ; ; 11 May 1930 – 6 August 2002) was a Dutch computer scientist, programmer, software engineer, mathematician, and science essayist. Born in Rotterdam in the Netherlands, Dijkstra studied mathematics and physics and then theoretical physics at the University of Leiden. Adriaan van Wijngaarden offered him a job as the first computer programmer in the Netherlands at the Mathematical Centre in Amsterdam, where he worked from 1952 until 1962. He formulated and solved the shortest path problem in 1956, and in 1960 developed the first compiler for the programming language ALGOL 60 in conjunction with colleague Jaap A. Zonneveld. In 1962 he moved to Eindhoven, and later to Nuenen, where he became a professor in the Mathematics Department at the Technische Hogeschool Eindhoven. In the late 1960s he built the THE multiprogramming system, which influenced the designs of subsequent systems through its use of software-based paged virtual memory. Dijkstra joined ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
MIT Press
The MIT Press is the university press of the Massachusetts Institute of Technology (MIT), a private research university in Cambridge, Massachusetts. The MIT Press publishes a number of academic journals and has been a pioneer in the Open Access movement in academic publishing. History MIT Press traces its origins back to 1926 when MIT published a lecture series entitled ''Problems of Atomic Dynamics'' given by the visiting German physicist and later Nobel Prize winner, Max Born. In 1932, MIT's publishing operations were first formally instituted by the creation of an imprint called Technology Press. This imprint was founded by James R. Killian, Jr., at the time editor of MIT's alumni magazine and later to become MIT president. Technology Press published eight titles independently, then in 1937 entered into an arrangement with John Wiley & Sons in which Wiley took over marketing and editorial responsibilities. In 1961, the centennial of MIT's founding charter, the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Joe Stoy
Joseph E. Stoy is a British computer scientist. He initially studied physics at Oxford University. Early in his career, in the 1970s, he worked on denotational semantics with Christopher Strachey in the Programming Research Group at the Oxford University Computing Laboratory (now the Oxford University Department of Computer Science). He was a Fellow of Balliol College, Oxford. He has also spent time at the Massachusetts Institute of Technology (MIT) in the United States. In 2003, he co-founded Bluespec, Inc., a United States electronic design automation company. It provides a functional programming language named ''Bluespec SystemVerilog'' (BSV), a Haskell variant extended as a high-level hardware description language to design electronic chips. His book ''Denotational Semantics: The Scott-Strachey Approach to Programming Language Semantics'' (MIT Press, 1977) is now a classic text. Stoy married Gabrielle Stoy, a mathematician and Fellow of Lady Margaret Hall, Oxford. Refere ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Guarded Commands
The Guarded Command Language (GCL) is a programming language defined by Edsger Dijkstra for predicate transformer semantics in EWD472. It combines programming concepts in a compact way. It makes it easier to develop a program and its proof hand-in-hand, with the proof ideas leading the way; moreover, parts of a program can actually be ''calculated''. An important property of GCL is nondeterminism. For example, in the if-statement, several alternatives may be true, and the choice is made at runtime, when the if-statement is executed. This frees the programmer from having to make unnecessary choices and is an aid in the formal development of programs. GCL includes the multiple assignment statement. For example, execution of the statement is done by first evaluating the righthand side values and then storing them in the lefthand variables. Thus, this statement swaps the values of and . The following books discuss the development of programs using GCL: * * * * * Guarded command ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Irene Greif
Irene Greif is an American computer scientist and a founder of the field of computer-supported cooperative work (CSCW). She was the first woman to earn a Ph.D. in computer science from the Massachusetts Institute of Technology. Early life and education Greif's mother was an accountant, and a native of New York City. Greif has at least one sibling, a sister. She attended Hunter College High School before earning her undergraduate and graduate degrees from MIT. In 1975, Greif became the first woman to earn a Ph.D. in computer science from MIT; in her dissertation of that year, she published the first operational actor model. Career She was a professor of computer science at the University of Washington before returning to MIT as a professor of electrical engineering and computer science (1977–87). In 1984, Greif and Paul Cashman coined the term "Computer Supported Cooperative Work" and the initials, CSCW, at an interdisciplinary workshop in Cambridge, Massachusetts. Preferrin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Power Domains
In denotational semantics and domain theory, power domains are domains of nondeterministic and concurrent computations. The idea of power domains for functions is that a nondeterministic function may be described as a deterministic set-valued function, where the set contains all values the nondeterministic function can take for a given argument. For concurrent systems, the idea is to express the set of all possible computations. Roughly speaking, a power domain is a domain whose elements are certain subsets of a domain. Taking this approach naively, though, often gives rise to domains that don't quite have the desired properties, and so one is led to increasingly complicated notions of the power domain. There are three common variants: the Plotkin, upper, and lower power domains. One way to understand these concepts is as free models of theories of nondeterminism. For most of this article we use the terms "domain" and "continuous function" quite loosely, meaning respectively s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Completeness (order Theory)
In the mathematical area of order theory, completeness properties assert the existence of certain infima or suprema of a given partially ordered set (poset). The most familiar example is the completeness of the real numbers. A special use of the term refers to complete partial orders or complete lattices. However, many other interesting notions of completeness exist. The motivation for considering completeness properties derives from the great importance of suprema (least upper bounds, joins, "\vee") and infima (greatest lower bounds, meets, "\wedge") to the theory of partial orders. Finding a supremum means to single out one distinguished least element from the set of upper bounds. On the one hand, these special elements often embody certain concrete properties that are interesting for the given application (such as being the least common multiple of a set of numbers or the union of a collection of sets). On the other hand, the knowledge that certain types of subset ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
