𝔖 Bobbio Scriptorium
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More about the “geography” of context-free languages

✍ Scribed by J. Beauquier; J. Berstel


Book ID
114037577
Publisher
Elsevier Science
Year
1981
Weight
728 KB
Volume
49
Category
Article
ISSN
0019-9958

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Remarks about Commutative Context-Free L
✍ Juha Kortelainen 📂 Article 📅 1998 🏛 Elsevier Science 🌐 English ⚖ 205 KB

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