Geodesic
On the ranks of certain finite semigroups of order-decreasing transformations.
Portugaliae mathematica, Tome 53 (1996) no. 1, pp. 23-34.

Voir la notice de l'article provenant de la source European Digital Mathematics Library

Keywords: transformation semigroups, Stirling numbers, totally ordered finite sets, partial one-to-one maps, generating sets, rank 
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Umar, Abdullahi. On the ranks of certain finite semigroups of order-decreasing transformations.. Portugaliae mathematica, Tome 53 (1996) no. 1, pp. 23-34. http://geodesic.mathdoc.fr/item/PORMA_1996__53_1_47476/