PUBLICATIONS DE L'INSTITUT MATHÉMATIQUE (BEOGRAD) (N.S.)
Vol. 29(43), pp. 15--21 (1981)
Stojan Bogdanovi\'cEkonomski fakultet, Nis, Yugoslavia
Abstract: Here, we give the definition of $Q_r$-semigroup i.e., a semigroup in which every proper right ideal is a power joined semigroup and we give as well some characterizations of weakly commutative $Q_r$-semigroups,
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