Unrestricted grammar
Language Theory / From Wikipedia, the free encyclopedia
Dear Wikiwand AI, let's keep it short by simply answering these key questions:
Can you list the top facts and stats about Unrestricted grammar?
Summarize this article for a 10 year old
SHOW ALL QUESTIONS
In automata theory, the class of unrestricted grammars (also called semi-Thue, type-0 or phrase structure grammars) is the most general class of grammars in the Chomsky hierarchy. No restrictions are made on the productions of an unrestricted grammar, other than each of their left-hand sides being non-empty.[1]:ā220ā This grammar class can generate arbitrary recursively enumerable languages.