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A note on the structure of some types of semigroups. (English) Zbl 0153.34602


References:

[1] Petrich M.: Semigroups certain of whose subsemigroups have identities. Czechosl. Math. J. 16 (91) (1966), 186-198. · Zbl 0143.03203
[2] Schwarz Š.: Teória pologrúp. Sborník prác Prír. fak. Slov. univ. v Bratislave 6 (1943), 1-64. · Zbl 0063.06833
[3] Kolibiarová B.: O pologrupách, ktorých kazdá čiastočná pologrupa má ľavú jednotku. Mat.-fyz. časop. 7 (1957), 177-182.
[4] Kolibiarová B.: On a product of semigroups. Mat.-fyz. časop. 15 (1965), 304-312. · Zbl 0133.27701
[5] Birkhoff G.: Lattice theory. New York 1948. · Zbl 0033.10103
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