Romano, Daniel Abraham A left compatible coequality relation on a semigroup with apartness. (English) Zbl 1006.03037 Novi Sad J. Math. 29, No. 2, 221-234 (1999). The author presents a characterization of the left coequality relation \(q\) on a semigroup with apartness and a construction of a quasi-antiorder \(c\) such that \(q=c\cup c^{-1}\), followed by the corresponding descriptions of classes of relations \(c\) and \(q\). Reviewer: Branislav Boričić (Beograd) MSC: 03F65 Other constructive mathematics 20M99 Semigroups Keywords:consistent subset; filled product of relations; quasi-antiorder; semigroup with apartness; left coequality PDFBibTeX XMLCite \textit{D. A. Romano}, Novi Sad J. Math. 29, No. 2, 221--234 (1999; Zbl 1006.03037) Full Text: EuDML