Geodesic
Certain congruence and quotient lattices related to completely 0-simple and primitive regular semigroups
Glasgow mathematical journal, Tome 10 (1969) no. 1, pp. 21-24

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G. Lallement [4] has shown that the lattice of congruences, Λ(S), on a completely 0-simple semigroup S is semimodular, thus improving G. B. Preston's result [5] that such a lattice satisfies the Jordan-Dedekind chain condition. More recently, J. M. Howie [2] has given a new and more simple proof of Lallement's result using work due to Tamura [9]. The purpose of this note is to extend the semimodularity result to primitive regular semigroups, to establish a theorem relating certain congruence and quotient lattices, and to provide a theorem for congruences on any regular semigroup. 
Scheiblich, H. E. Certain congruence and quotient lattices related to completely 0-simple and primitive regular semigroups. Glasgow mathematical journal, Tome 10 (1969) no. 1, pp. 21-24. doi: 10.1017/S0017089500000483
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