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On commutative context-free languages

โœ Scribed by J. Beauquier; M. Blattner; M. Latteux


Publisher
Elsevier Science
Year
1987
Tongue
English
Weight
620 KB
Volume
35
Category
Article
ISSN
0022-0000

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Remarks about Commutative Context-Free L
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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

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The Green function of an arbitrary, finitely supported random walk on a discrete group with context-free word problem is algebraic. It is shown how this theorem can be deduced from basic results of formal language theory. Context-free groups are precisely the finite extensions of free groups.