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Characterizations of the decidability of some problems for regular trace languages. (English) Zbl 0679.68132
Summary: The decidability of the equivalence problem and the disjointness problem for regular trace languages is considered. By describing the structure of the independence relations involved, precise characterizations are given of those concurrency alphabets for which these problems are decidable. In fact, the first problem is decidable if and only if the independence relation is transitive, while the second problem is decidable if and only if the independence relation is a so-called transitive forest.

68Q45 Formal languages and automata
03D60 Computability and recursion theory on ordinals, admissible sets, etc.
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