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The minimum-length generator sequence problem is NP-hard

โœ Scribed by S Even; O Goldreich


Publisher
Elsevier Science
Year
1981
Tongue
English
Weight
148 KB
Volume
2
Category
Article
ISSN
0196-6774

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The STO-problem is NP-hard
โœ Krzysztof R. Apt; Peter van Emde Boas; Angelo Welling ๐Ÿ“‚ Article ๐Ÿ“… 1994 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 209 KB

A finite set of term equations \(E\) is called subject to the occur-check (STO) if a sequence of actions of the Martelli-Montanari unification algorithm starts with \(E\) and ends with a failure due to occur-check. We prove here that the problem of deciding whether \(E\) is STO is NP-hard.