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On Normal Forms and Erasing Rules in Path Controlled Grammars

Koutnŷ J., Meduna A.

Schedae Informaticae

2013

Vol. 22

9--18

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.