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Symmetric relations (undirected graphs) with given semigroups. (English) Zbl 0139.24803


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References:

[1] Z. Hedrlín, A. Pultr, Relations (Graphs) with Given Finitely Generated Semigroups, Mh. Math.68 (1964), 213-217. · Zbl 0126.26602 · doi:10.1007/BF01298508
[2] A. Pultr, Z. Hedrilín, Relations (Graphs) with Given Infinite Semigroups, Mh. Math.68 (1964), 421-425. · Zbl 0139.24802 · doi:10.1007/BF01304185
[3] O. Ore, Theory of Graphs, Rhode Island, 1962. · Zbl 0105.35401
[4] A. Pultr, Concerning Universal Categories, Comm. Math. Univ. Car.,5, 4 (1964), 227-239. · Zbl 0135.02101
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