Formal languages

Terminal and nonterminal symbols

In computer science, terminal and nonterminal symbols are the lexical elements used in specifying the production rules constituting a formal grammar. Terminal symbols are the elementary symbols of the language defined by a formal grammar. Nonterminal symbols (or syntactic variables) are replaced by groups of terminal symbols according to the production rules. The terminals and nonterminals of a particular grammar are two disjoint sets. (Wikipedia).

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Related pages

Disjoint sets | Formal grammar | Kleene star | Production (computer science) | Phrase structure grammar | Union (set theory) | Recursive grammar | Empty string | Formal language | String generation | Context-free grammar | Backusโ€“Naur form