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In logic, a metavariable (also metalinguistic variable〔Geoffrey Hunter, ''Metalogic: An Introduction to the Metatheory of Standard First-Order Logic'' p.13〕 or syntactical variable) is a symbol or symbol string which belongs to a metalanguage and stands for elements of some object language. For instance, in the sentence :''Let A and B be two sentences of a language ℒ'' the symbols A and B are part of the metalanguage in which the statement about the object language ℒ is formulated. John Corcoran considers this terminology unfortunate because it obscures the use of schemata and because such "variables" do not actually range over a domain.〔Corcoran, J. 2006. Schemata: the Concept of Schema in the History of Logic. ''Bulletin of Symbolic Logic'' 12: 219-40〕 The convention is that a metavariable is to be uniformly substituted with the same instance in all its appearances in a given schema. This is in contrast with nonterminal symbols in formal grammars where the nonterminals on the right of a production can be substituted by different instances. Attempts to formalize the notion of metavariable result in some kind of type theory.〔Masahiko Sato, Takafumi Sakurai, Yukiyoshi Kameyama, and Atsushi Igarashi. "(Calculi of Meta-variables )" in ''Computer Science Logic. 17th International Workshop CSL 2003. 12th Annual Conference of the EACSL. 8th Kurt Gödel Colloquium, KGC 2003, Vienna, Austria, August 25-30, 2003. Proceedings'', Springer Lecture Notes in Computer Science 2803. ISBN 3-540-40801-0. pp. 484–497〕 In computing one often needs to specify and document the syntax and semantics of a computer language, more or less formally. A term often used for metavariable in that area is "metasyntactic variable". Furthermore, because of the common practice in hacker culture to use nonsense words like "foo" as metavariables, the term "metasyntactic variable" has come to denote such words by themselves; for instance, "foo" is referred to as "the first metasyntactic variable" in the first edition of ''The Hacker's Dictionary''. ==See also== *Explicit substitution 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「metavariable」の詳細全文を読む スポンサード リンク
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