A characterization of semilattices of left or right groups

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A characterization of semilattices of left or right groups. (English). Czechoslovak Mathematical Journal, vol. 22 (1972), issue 4, pp. 522-524

References:

[1] B. Pondělíček: On a certain relation for closure operations on a semigroup. Czechoslovak Math. J. 20 (95), (1970), 220-231. MR 0260905

[2] B. Pondělíček: A certain equivalence on a semigroup. Czechoslovak Math. J. 21 (96), (1971), 109-117. MR 0283110

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