Geodesic
On the ranks of certain finite semigroups of order-decreasing transformations.
Portugaliae mathematica, Tome 53 (1996) no. 1, pp. 23-34 Cet article a éte moissonné depuis la source European Digital Mathematics Library

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Keywords: transformation semigroups, Stirling numbers, totally ordered finite sets, partial one-to-one maps, generating sets, rank 
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     author = {Umar, Abdullahi},
     title = {On the ranks of certain finite semigroups of order-decreasing transformations.},
     journal = {Portugaliae mathematica},
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     year = {1996},
     volume = {53},
     number = {1},
     zbl = {0844.20050},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1996__53_1_47476/}
}
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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/