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Regular elements of the semigroup of all binary relations. (English) Zbl 0355.20058

##### MSC:
 20M05 Free semigroups, generators and relations, word problems 20M99 Semigroups 03E20 Other classical set theory (including functions, relations, and set algebra) 08A05 Structure theory of algebraic structures 05B20 Combinatorial aspects of matrices (incidence, Hadamard, etc.) 05C20 Directed graphs (digraphs), tournaments
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##### References:
 [1] ЭapeшклЛ, K. A.,Peгулярныe eмeнтыпoлугрппы {$$\sigma$$}инaрныxoтнoшeний, Спeхи MaтeмaтичeсКих Hayк 17 (1962), 177–179. [2] ЭapeшкиИ, K. A.,Плучруппa {$$\sigma$$}инaрныхoтнoшeний, Maтeмaтичecкий C{$$\sigma$$}oрник 61 (1963), 291–305 [3] Yang, Jaw-Ching,A theorem on the semigroup of binary relations, Proceedings of the American Mathematical Society 22 (1969), 134–135. · Zbl 0206.01403 [4] Wolk, E. S.,A characterization of partial order, Bulletin de l’Academie Polonaise des Sciences, Serie des Sciences Mathématiques, Astronomiques et Physiques 17 (1969), 207–208. · Zbl 0175.01202
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