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On subsemigroups of free semigroups. (English) Zbl 0111.03801


Keywords:

group theory
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References:

[1] A. H. Clifford, Review of [3], Math. Rev. 9 (1948), 174.
[2] P. M. Cohn, On a generalization of the Euclidean algorithm, Proc. Cambridge Philos. Soc. 57 (1961), 18-30. · Zbl 0098.03202
[3] M.-L. Dubreil-Jacotin, Sur l’immersion d’un semigroupe dans un groupe, C. R. Acad. Sci. Paris 225 (1947), 787-788.
[4] L. N. Ševrin, On subsemigroups of free semigroups, Dokl. Akad. Nauk SSSR 133 (1960), 537-539 (Russian) = Soviet Math. Dokl. 1 (1960), 892-894.
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