Alternative Definition
Another way to define Chomsky normal form (e.g., Hopcroft and Ullman 1978,and Hopcroft et al. 2006) is:
A formal grammar is in Chomsky reduced form if all of its production rules are of the form:
- or
where, and are nonterminal symbols, and α is a terminal symbol. When using this definition, or may be the start symbol. Only those context-free grammars which do not generate the empty string can be transformed into Chomsky reduced form.
Read more about this topic: Chomsky Normal Form
Famous quotes containing the words alternative and/or definition:
“A mental disease has swept the planet: banalization.... Presented with the alternative of love or a garbage disposal unit, young people of all countries have chosen the garbage disposal unit.”
—Ivan Chtcheglov (b. 1934)
“It’s a rare parent who can see his or her child clearly and objectively. At a school board meeting I attended . . . the only definition of a gifted child on which everyone in the audience could agree was “mine.””
—Jane Adams (20th century)