4-1b Simplification of Context Free Grammar – II
Автор: Dr. Vikramathithan A C
Загружено: 2025-12-24
Просмотров: 127
Описание:
Normal Form is a standardized, restricted format for the production rules of a Context-Free Grammar (CFG). While normalization imposes structural constraints, it does not change the language the grammar generates.
There are two primary normal forms used to simplify parsing and theoretical proofs:
Chomsky Normal Form (CNF), A CFG is in Chomsky Normal Form if all its production rules follow one of these two structures: A gives BC, Non-terminal derives exactly two non-terminals. A gives a, Non-terminal derives exactly one terminal symbol.
Greibach Normal Form (GNF) A CFG is in Greibach Normal Form if every production rule is of the form: Non-terminal derives exactly one terminal A gives aABC, followed by one or more non-terminals. Non Terminal derives one Terminal A gives a.
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