Abstract
Each context-free grammar can be transformed to a context-free grammar in Greibach normal form, that is, a context-free grammar where each right-hand side of a prorfuction begins with a terminal symbol and the remainder of the right-hand side consists of nonterminal symbols. In this short paper we show that for a left-regular grammar G we can obtain a right-regular grammar G’ (which is by definition in Greibach normal form) which left-to-right covers G (in this case left parses of G’ can be mapped by a homomorphism on right parses of G. Moreover, it is possible to obtain a context-free grammar G��? in Greibach normal form which right covers the left-regular grammar G (in this case right parses of G��? are mapped on right parses of G).
Original language | Undefined |
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Article number | 10.1016/0020-0190(79)90109-1 |
Pages (from-to) | 51-55 |
Number of pages | 5 |
Journal | Information processing letters |
Volume | 9 |
Issue number | 1 |
DOIs | |
Publication status | Published - 20 Jul 1979 |
Keywords
- IR-66922
- EWI-9212