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Theoretical Computer Science
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Relative undecidability in term rewriting: II. the confluence hierarchy
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Decision Problems for Semi-Thue Systems with a Few Rules
LICS '96 Proceedings of the 11th Annual IEEE Symposium on Logic in Computer Science
Reachability and confluence are undecidable for flat term rewriting systems
Information Processing Letters
Termination of rewrite systems with shallow right-linear, collapsing, and right-ground rules
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Confluence of shallow right-linear rewrite systems
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Fundamenta Informaticae - Words, Graphs, Automata, and Languages; Special Issue Honoring the 60th Birthday of Professor Tero Harju
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Length-two string rewriting systems are length-preserving string rewriting systems that consist of length-two rules. This paper shows that confluence, termination, left-most termination and right-most termination are undecidable properties for length-two string rewriting systems. These results mean that these properties are undecidable for the class of linear term rewriting systems in which depth-two variables are allowed in both sides of rules.