Geodesic
On right unipotent semigroups II
Glasgow mathematical journal, Tome 19 (1978) no. 1, pp. 63-68

Voir la notice de l'article provenant de la source Cambridge University Press

We describe two congruences α and γ contained in L on an arbitrary orthodox semigroup. Let S be a right unipotent semigroup. We show that (i) α is an inverse semigroup congruence and γ is the finest fundamental inverse semigroup congruence on S, (ii) S is a union of groups if and only if L on S and (iii) S is a band of groups if and only if L on S. 
Venkatesan, P. S. On right unipotent semigroups II. Glasgow mathematical journal, Tome 19 (1978) no. 1, pp. 63-68. doi: 10.1017/S0017089500003384
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