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Nešetřil, Jaroslav
Every group is a maximal subgroup of the semigroup of relations. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 12 (1971), issue 1, pp. 19-21
MSC: 08A05, 20-95, 20M20 | MR 0283123 | Zbl 0221.20093
References:
[1] Z. HEDRLÍN, A. PULTR: Symmetric relations (undirected graphs) with given semigroups. Monatsh. für Math. 69 (1965), 318-322. MR 0188082 | Zbl 0139.24803
[2] J. S. MONTAGUE, R. J. PLEMMONS: Maximal subgroups of the semigroups of relations. J. of Algebra 13 (1969), 575-587. MR 0252539
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