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Bisimple weakly inverse semigroups with partial right unitoids
Glasgow mathematical journal, Tome 30 (1988) no. 1, pp. 1-10

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In an earlier paper [5] of the author bisimple weakly inverse semigroups with partial identities were studied. The aim of this paper is to extend the results to a wider class of semigroups, viz: bisimple weakly inverse semigroups with partial right unitoids. It is found that an R-class of weakly inverse semigroup is a right skew groupoid R = (R, P), where P is a right skew semigroup [5], P⊆R, and R is a partial semigroup satisfying certain conditions. When S is a bisimple weakly inverse semigroup with E the set of partial right unitoids, it can be shown that the R-class R = (R, P) containing E, which is a right skew groupoid, satisfies the following:(i) for any a, b ∈ R, there exists c ∈ R such that Pa ∩ Pb = Pc;(ii) for any a ∈ R, there exists a left identity e of R such that (Pa ∩ P)e = Pa ∩ P. 
Madhavan, S. Bisimple weakly inverse semigroups with partial right unitoids. Glasgow mathematical journal, Tome 30 (1988) no. 1, pp. 1-10. doi: 10.1017/S0017089500006972
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