Geodesic
Semigroup varieties closed for the Bruck extension
Glasgow mathematical journal, Tome 36 (1994) no. 3, pp. 371-380

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

We shall show that there exists a chain, order isomorphic to the chain of real numbers, of semigroup varieties closed for the Bruck extension. The least semigroup variety closed for the Bruck extension will be obtained as the union of varieties in an infinite chain of semigroup varieties. 
Pastijn, Francis; Yan, Xiaoying. Semigroup varieties closed for the Bruck extension. Glasgow mathematical journal, Tome 36 (1994) no. 3, pp. 371-380. doi: 10.1017/S0017089500030986
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