Geodesic
Every group is a maximal subgroup of the semigroup of relations
Commentationes Mathematicae Universitatis Carolinae, Tome 12 (1971) no. 1, pp. 19-21 Cet article a éte moissonné depuis la source Czech Digital Mathematics Library

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Classification : 08A05, 20-95, 20M20 
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Nešetřil, Jaroslav. Every group is a maximal subgroup of the semigroup of relations. Commentationes Mathematicae Universitatis Carolinae, Tome 12 (1971) no. 1, pp. 19-21. http://geodesic.mathdoc.fr/item/CMUC_1971_12_1_a2/

[1] Z. HEDRLÍN, A. PULTR: Symmetric relations (undirected graphs) with given semigroups. Monatsh. für Math. 69 (1965), 318-322. | MR | Zbl

[2] J. S. MONTAGUE, R. J. PLEMMONS: Maximal subgroups of the semigroups of relations. J. of Algebra 13 (1969), 575-587. | MR