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The complexity of testing ground reducibility for linear word rewriting systems with variables

Identifieur interne : 003C39 ( Istex/Corpus ); précédent : 003C38; suivant : 003C40

The complexity of testing ground reducibility for linear word rewriting systems with variables

Auteurs : Gregory Kucherov ; Michaël Rusinowitch

Source :

RBID : ISTEX:FBA4E50079058BCCEE4BBF728E33F6DC3A91E82E

Abstract

Abstract: In [9] we proved that for a word rewriting system with variables $$x\mathcal{R}$$ and a word with variables Ω, it is undecidable if Ω is ground reducible by $$x\mathcal{R}$$ , that is if all the instances of Ω obtained by substituting its variables by non-empty words are reducible by $$x\mathcal{R}$$ . On the other hand, if $$x\mathcal{R}$$ is linear, the question is decidable for arbitrary (linear or non-linear) Ω. In this paper we futher study the complexity of the above problem and prove that it is co-NP-complete if both $$x\mathcal{R}$$ and Ω are restricted to be linear. The proof is based on the construction of a deterministic finite automaton for the language of words reducible by $$x\mathcal{R}$$ . The construction generalizes the well-known Aho-Corasick automaton for string matching against a set of keywords.

Url:
DOI: 10.1007/3-540-60381-6_16

Links to Exploration step

ISTEX:FBA4E50079058BCCEE4BBF728E33F6DC3A91E82E

Le document en format XML

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<Para>In [9] we proved that for a word rewriting system with variables
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and a word with variables
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, it is undecidable if
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is ground reducible by
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, that is if all the instances of
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. On the other hand, if
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is linear, the question is decidable for arbitrary (linear or non-linear)
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. In this paper we futher study the complexity of the above problem and prove that it is
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-complete if both
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and
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are restricted to be linear. The proof is based on the construction of a deterministic finite automaton for the language of words reducible by
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. The construction generalizes the well-known Aho-Corasick automaton for string matching against a set of keywords.</Para>
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<abstract lang="en">Abstract: In [9] we proved that for a word rewriting system with variables $$x\mathcal{R}$$ and a word with variables Ω, it is undecidable if Ω is ground reducible by $$x\mathcal{R}$$ , that is if all the instances of Ω obtained by substituting its variables by non-empty words are reducible by $$x\mathcal{R}$$ . On the other hand, if $$x\mathcal{R}$$ is linear, the question is decidable for arbitrary (linear or non-linear) Ω. In this paper we futher study the complexity of the above problem and prove that it is co-NP-complete if both $$x\mathcal{R}$$ and Ω are restricted to be linear. The proof is based on the construction of a deterministic finite automaton for the language of words reducible by $$x\mathcal{R}$$ . The construction generalizes the well-known Aho-Corasick automaton for string matching against a set of keywords.</abstract>
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