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In computer science, a Van Wijngaarden grammar (also vW-grammar or W-grammar [1]) is a formalism for defining formal languages. The name derives from the formalism invented by Adriaan van Wijngaarden [2] for the purpose of defining the ALGOL 68 programming language. The resulting specification [3] remains its most notable application.
Adriaan "Aad" van Wijngaarden (2 November 1916 – 7 February 1987) was a Dutch mathematician and computer scientist. Trained as a mechanical engineer, Van Wijngaarden emphasized and promoted the mathematical aspects of computing, first in numerical analysis , then in programming languages and finally in design principles of such languages.
Van Wijngaarden grammar (also vW-grammar or W-grammar) is a two-level grammar that provides a technique to define potentially infinite context-free grammars in a finite number of rules. The formalism was invented by Adriaan van Wijngaarden to rigorously define some syntactic restrictions that previously had to be formulated in natural language ...
Van Wijngaarden grammar; W. Well-formed formula; WFF 'N PROOF (previous page) This page was last edited on 19 June 2024, at 01:18 (UTC). Text is available ...
EAGs are a member of the family of two-level grammars; more specifically, a restriction of Van Wijngaarden grammars with the specific purpose of making parsing feasible. Like Van Wijngaarden grammars, EAGs have hyperrules that form a context-free grammar except in that their nonterminals may have arguments, known as affixes , the possible ...
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Struck Gogh-ld. A newly discovered Vincent van Gogh painting worth $15 million was likely found at a dusty Minnesota garage sale — where a buyer plunked down less than $50 for the world-famous ...