scientific article; zbMATH DE number 1972777
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Publication:4421568
zbMath1030.20034MaRDI QIDQ4421568
Publication date: 16 October 2003
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Varieties and pseudovarieties of semigroups (20M07) Free semigroups, generators and relations, word problems (20M05) Undecidability and degrees of sets of sentences (03D35)
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