Geodesic
Tight Semigroups
Publications de l'Institut Mathématique, _N_S_50 (1991) no. 64, p. 71 Cet article a éte moissonné depuis la source eLibrary of Mathematical Institute of the Serbian Academy of Sciences and Arts

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We give a description of tight semigroups, i.e., semigroups in which for every subset $M$, $|M|\le 2$ implies that $|M^2|\le 2$.
Classification : 20M10 
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     author = {Stojan Bogdanovi\'c and Miroslav \'Ciri\'c},
     title = {Tight {Semigroups}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {71 },
     year = {1991},
     volume = {_N_S_50},
     number = {64},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PIM_1991_N_S_50_64_a9/}
}
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Stojan Bogdanović; Miroslav Ćirić. Tight Semigroups. Publications de l'Institut Mathématique, _N_S_50 (1991) no. 64, p. 71 . http://geodesic.mathdoc.fr/item/PIM_1991_N_S_50_64_a9/