Failure of a conjecture about context free languages
β Scribed by Joseph Ullian
- Book ID
- 114036544
- Publisher
- Elsevier Science
- Year
- 1966
- Weight
- 230 KB
- Volume
- 9
- Category
- Article
- ISSN
- 0019-9958
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π SIMILAR VOLUMES
We prove that the complement of a commutative language L is context-free if the Parikh-map of L is a proper linear set. Some sharpenings to results considering the Fliess conjecture on commutative contextfree languages are given. A conjecture concerning commutative star languages is disproved by a c
A bracketed grammar is a context-free grammar in which indexed brackets are inserted around the right-hand sides of the rules. The language generated by a bracketed grammar is a bracketed language. An algebraic condition is given for one bracketed language to be a subset of another. The intersection