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Lambert Meertens
Lambert Guillaume Louis Théodore Meertens or L.G.L.T. Meertens (born 10 May 1944, in Amsterdam) is a Dutch computer scientist and professor. , he is a researcher at the Kestrel Institute, a nonprofit computer science research center in Palo Alto's Stanford Research Park. Life and career As a student at the Ignatius Gymnasium in Amsterdam, Meertens designed a computer with Kees Koster, a classmate. In the 1960s, Meertens applied affix grammars to the description and composition of music, and obtained a special prize from the jury at the 1968 International Federation for Information Processing (IFIP) Congress in Edinburgh for his computer-generated string quartet, Quartet No. 1 in C major for 2 violins, viola and violoncello, based on the first non- context-free affix grammar. The string quartet was published in 1968, as ''Mathematical Centre Report MR 96''. Meertens was one of the editors of the Revised ALGOL 68 Report. He was the originator and one of the designers of the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Brackets
A bracket is either of two tall fore- or back-facing punctuation marks commonly used to isolate a segment of text or data from its surroundings. Typically deployed in symmetric pairs, an individual bracket may be identified as a 'left' or 'right' bracket or, alternatively, an "opening bracket" or "closing bracket", respectively, depending on the directionality of the context. Specific forms of the mark include parentheses (also called "rounded brackets"), square brackets, curly brackets (also called 'braces'), and angle brackets (also called 'chevrons'), as well as various less common pairs of symbols. As well as signifying the overall class of punctuation, the word "bracket" is commonly used to refer to a specific form of bracket, which varies from region to region. In most English-speaking countries, an unqualified word "bracket" refers to the parenthesis (round bracket); in the United States, the square bracket. Various forms of brackets are used in mathematics, with ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Affix Grammar
An affix grammar is a kind of formal grammar; it is used to describe the syntax of languages, mainly computer languages, using an approach based on how natural language is typically described.Koster, Cornelis HA.Affix grammars for natural languages" Attribute Grammars, Applications and Systems. Springer, Berlin, Heidelberg, 1991. The grammatical rules of an affix grammar are those of a context-free grammar, except that certain parts in the nonterminals (the affixes) are used as arguments. If the same affix occurs multiple times in a rule, its value must agree, i.e. it must be the same everywhere. In some types of affix grammar, more complex relationships between affix values are possible. Example We can describe an extremely simple fragment of English in the following manner: : ''Sentence'' → ''Subject'' ''Predicate'' : ''Subject'' → ''Noun'' : ''Predicate'' → ''Verb'' ''Object'' : ''Object'' → ''Noun'' : : ''Noun'' → John : ''Noun'' → Mary : ''Noun'' → childr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chairperson
The chairperson, also chairman, chairwoman or chair, is the presiding officer of an organized group such as a Board of directors, board, committee, or deliberative assembly. The person holding the office, who is typically elected or appointed by members of the group, presides over meetings of the group, and conducts the group's business in an orderly fashion. In some organizations, the chairperson is also known as ''President (corporate title), president'' (or other title). In others, where a board appoints a president (or other title), the two terms are used for distinct positions. Also, the chairman term may be used in a neutral manner not directly implying the gender of the holder. Terminology Terms for the office and its holder include ''chair'', ''chairperson'', ''chairman'', ''chairwoman'', ''convenor'', ''facilitator'', ''moderator (town official), moderator'', ''president'', and ''presiding officer''. The chairperson of a parliamentary chamber is often called the ''Spe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
ALGOL 60
ALGOL 60 (short for ''Algorithmic Language 1960'') is a member of the ALGOL family of computer programming languages. It followed on from ALGOL 58 which had introduced code blocks and the begin and end pairs for delimiting them, representing a key advance in the rise of structured programming. ALGOL 60 was the first language implementing nested function definitions with lexical scope. It gave rise to many other programming languages, including CPL, Simula, BCPL, B, Pascal, and C. Practically every computer of the era had a systems programming language based on ALGOL 60 concepts. Niklaus Wirth based his own ALGOL W on ALGOL 60 before moving to develop Pascal. Algol-W was intended to be the next generation ALGOL but the ALGOL 68 committee decided on a design that was more complex and advanced rather than a cleaned simplified ALGOL 60. The official ALGOL versions are named after the year they were first published. Algol 68 is substantially different from Algol 60 and was ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Specification (technical Standard)
A specification often refers to a set of documented requirements to be satisfied by a material, design, product, or service. A specification is often a type of technical standard. There are different types of technical or engineering specifications (specs), and the term is used differently in different technical contexts. They often refer to particular documents, and/or particular information within them. The word ''specification'' is broadly defined as "to state explicitly or in detail" or "to be specific". A requirement specification is a documented requirement, or set of documented requirements, to be satisfied by a given material, design, product, service, etc. It is a common early part of engineering design and product development processes in many fields. A functional specification is a kind of requirement specification, and may show functional block diagrams. A design or product specification describes the features of the ''solutions'' for the Requirement Specificatio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
International Standard
international standard is a technical standard developed by one or more international standards organization, standards organizations. International standards are available for consideration and use worldwide. The most prominent such organization is the International Organization for Standardization (ISO). Other prominent international standards organizations including the International Telecommunication Union (ITU) and the International Electrotechnical Commission (IEC). Together, these three organizations have formed the World Standards Cooperation alliance. Purpose International standards may be used either by direct application or by a process of modifying an international standard to suit local conditions. Adopting international standards results in creating national standards that are equivalent, or substantially the same as international standards in technical content, but may have (i) editorial differences as to appearance, use of symbols and measurement units, substitution ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Meertens Number
In number theory and mathematical logic, a Meertens number in a given number base b is a natural number that is its own Gödel number. It was named after Lambert Meertens by Richard S. Bird as a present during the celebration of his 25 years at the CWI, Amsterdam. Definition Let n be a natural number. We define the Meertens function for base b > 1 F_ : \mathbb \rightarrow \mathbb to be the following: :F_(n) = \sum_^ p_^. where k = \lfloor \log_ \rfloor + 1 is the number of digits in the number in base b, p_i is the i-prime number, and :d_i = \frac is the value of each digit of the number. A natural number n is a Meertens number if it is a fixed point for F_, which occurs if F_(n) = n. This corresponds to a Gödel encoding. For example, the number 3020 in base b = 4 is a Meertens number, because :3020 = 2^3^5^7^. A natural number n is a sociable Meertens number if it is a periodic point for F_, where F_^k(n) = n for a positive integer k, and forms a cycle of period k. A M ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Richard Bird (computer Scientist)
Richard Simpson Bird (4 February 1943 – 4 April 2022) was a Supernumerary Fellow of Computation at Lincoln College, University of Oxford, in Oxford England, and former director of the Oxford University Computing Laboratory (now the Department of Computer Science, University of Oxford). Bird's research interests lay in algorithm design and functional programming, and he was known as a regular contributor to the '' Journal of Functional Programming'' and the author of ''Introduction to Functional Programming using Haskell'' and other books. His name is associated with the Bird–Meertens formalism, a calculus for deriving programs from specifications in a functional programming style. Formerly, Bird was at the University of Reading. He was a member of the International Federation for Information Processing (IFIP) IFIP Working Group 2.1 on Algorithmic Languages and Calculi, which specified, supports, and maintains the programming languages ALGOL 60 and ALGOL 68 ALGOL 68 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pacifist Socialist Party
The Pacifist Socialist Party ( nl, Pacifistisch Socialistische Partij, PSP) was a democratic socialist Dutch socialist political party. The PSP played a small role in Dutch politics. It is one of the predecessors of the GreenLeft. Party history Before 1957 In 1955 a group of "politically homeless" activists had formed. The group mainly consisted of former members of the Labour Party (PvdA) and the Communist Party of the Netherlands (CPN). They had left the PvdA over the military intervention against the Indonesian independence movement and the Labour party's support for NATO. Many of them had a background in the orthodox Marxist wing of the Social Democratic Workers' Party or the Christian Democratic Union (CDU), which had merged into the PvdA. The former members of the CPN had left their party over the Stalinist course of the CPN. There was also a group of these politically homeless that had never been members of parties, while others had been member of pre-war parties such a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Python (programming Language)
Python is a high-level, general-purpose programming language. Its design philosophy emphasizes code readability with the use of significant indentation. Python is dynamically-typed and garbage-collected. It supports multiple programming paradigms, including structured (particularly procedural), object-oriented and functional programming. It is often described as a "batteries included" language due to its comprehensive standard library. Guido van Rossum began working on Python in the late 1980s as a successor to the ABC programming language and first released it in 1991 as Python 0.9.0. Python 2.0 was released in 2000 and introduced new features such as list comprehensions, cycle-detecting garbage collection, reference counting, and Unicode support. Python 3.0, released in 2008, was a major revision that is not completely backward-compatible with earlier versions. Python 2 was discontinued with version 2.7.18 in 2020. Python consistently ran ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Programming Language
A programming language is a system of notation for writing computer programs. Most programming languages are text-based formal languages, but they may also be graphical. They are a kind of computer language. The description of a programming language is usually split into the two components of syntax (form) and semantics (meaning), which are usually defined by a formal language. Some languages are defined by a specification document (for example, the C programming language is specified by an ISO Standard) while other languages (such as Perl) have a dominant implementation that is treated as a reference. Some languages have both, with the basic language defined by a standard and extensions taken from the dominant implementation being common. Programming language theory is the subfield of computer science that studies the design, implementation, analysis, characterization, and classification of programming languages. Definitions There are many considerations when defining ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
