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Recognizing the rank of coefficientless equations in a free semigroup. (English. Russian original) Zbl 0417.20050
Sov. Math., Dokl. 19, 1434-1417 (1978); translation from Dokl. Akad. Nauk SSSR 243, 851-854 (1978).

MSC:
20M05 Free semigroups, generators and relations, word problems
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