Context-Free Grammars - Chomsky Normal Form - Hampden ...
Context-Free Grammars - Chomsky Normal Form - Hampden ...
Context-Free Grammars - Chomsky Normal Form - Hampden ...
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CNF Derivations<strong>Context</strong>-<strong>Free</strong><strong>Grammars</strong> -<strong>Chomsky</strong><strong>Normal</strong> <strong>Form</strong>Robb T.KoetherHomeworkReview<strong>Chomsky</strong><strong>Normal</strong> <strong>Form</strong>New start symbolEliminate all ε-rulesEliminate all unitrulesTheoremIf a grammar G is in CNF and a string w in L(G) has lengthn, then w is derived from G in exactly 2n − 1 steps.Eliminate all mixedrulesEliminate all longrulesDerivations inCNFTheMembershipProblem forCFGsAssignment
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