normal forms for context-free grammars

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• Context-free grammar — In formal language theory, a context free grammar (CFG) is a formal grammar in which every production rule is of the form V → w where V is a single nonterminal symbol, and w is a string of terminals and/or nonterminals (w can be empty). The… …   Wikipedia

• Context-sensitive grammar — A context sensitive grammar (CSG) is a formal grammar in which the left hand sides and right hand sides of any production rules may be surrounded by a context of terminal and nonterminal symbols. Context sensitive grammars are more general than… …   Wikipedia

• Chomsky normal form — In computer science, a context free grammar is said to be in Chomsky normal form if all of its production rules are of the form: or or where A, B and C are nonterminal symbols, α is a terminal symbol (a symbol that represents a constant value), S …   Wikipedia

• CYK algorithm — The Cocke–Younger–Kasami (CYK) algorithm (alternatively called CKY) is a parsing algorithm for context free grammars. It employs bottom up parsing and dynamic programming. The standard version of CYK operates only on context free grammars given… …   Wikipedia

• Sheila Greibach — (1939 ) is a researcher in formal languages, automata, compiler theory in particular; and computer science in general. She is currently Professor of Computer Science at the University of California, Los Angeles.She worked with Seymour Ginsburg… …   Wikipedia

• Communications protocol — For other senses of this word, see Protocol. A communications protocol is a system of digital message formats and rules for exchanging those messages in or between computing systems and in telecommunications. A protocol may have a formal… …   Wikipedia

• Left recursion — In computer science, left recursion is a special case of recursion. In terms of context free grammar, a non terminal r is left recursive if the left most symbol in any of r’s ‘alternatives’ either immediately (direct left recursive) or through… …   Wikipedia

• Computability — You might be looking for Computable function, Computability theory, Computation, or Theory of computation. Computability is the ability to solve a problem in an effective manner. It is a key topic of the field of computability theory within… …   Wikipedia

• HEBREW GRAMMAR — The following entry is divided into two sections: an Introduction for the non specialist and (II) a detailed survey. [i] HEBREW GRAMMAR: AN INTRODUCTION There are four main phases in the history of the Hebrew language: the biblical or classical,… …   Encyclopedia of Judaism

• linguistics — /ling gwis tiks/, n. (used with a sing. v.) the science of language, including phonetics, phonology, morphology, syntax, semantics, pragmatics, and historical linguistics. [1850 55; see LINGUISTIC, ICS] * * * Study of the nature and structure of… …   Universalium

• HEBREW LANGUAGE — This entry is arranged according to the following scheme: pre biblical biblical the dead sea scrolls mishnaic medieval modern period A detailed table of contents precedes each section. PRE BIBLICAL nature of the evidence the sources phonology… …   Encyclopedia of Judaism