On Normal Forms and Erasing Rules in Path Controlled Grammars
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This paper discusses path controlled grammars-context-free gram- mars with a root-to-leaf path in their derivation trees restricted by a control language. First, it investigates the impact of erasing rules on the generative power of path controlled grammars. Then, it establishes two Chomsky-like normal forms for path controlled grammars-the first allows unit rules, the second allows just one erasing rule.
21 - 05 - 2015
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