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On subsemigroups of free semigroups. (English. Russian original) Zbl 0100.02401

Sov. Math., Dokl. 1, 892-894 (1960); translation from Dokl. Akad. Nauk SSSR 133, 537-539 (1960).

MSC:

20Mxx Semigroups

Keywords:

group theory
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