A shorter proof that palindromes are not a Church-Rosser language, with extensions to almost-confluent and preperfect Thue systems
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Publication:844899
DOI10.1016/j.tcs.2009.10.003zbMath1184.68276OpenAlexW2068700956MaRDI QIDQ844899
Natalie Schluter, Colm P. O'Dunlaing
Publication date: 5 February 2010
Published in: Theoretical Computer Science (Search for Journal in Brave)
Full work available at URL: https://doi.org/10.1016/j.tcs.2009.10.003
Formal languages and automata (68Q45) Algorithmic information theory (Kolmogorov complexity, etc.) (68Q30)
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- The undecidability of the preperfectness of Thue systems
- Preperfectness is undecidable for Thue systems containing only length- reducing rules and a single commutation rule
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- The Church-Rosser languages are the deterministic variants of the growing context-sensitive languages
- Lower bound technique for length-reducing automata
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