Geodesic
Length of the inverse symmetric semigroup
Algebra and discrete mathematics, Tome 12 (2011) no. 2, pp. 64-71.

Voir la notice de l'article provenant de la source Math-Net.Ru

The length of the lattice of subsemigroups of the inverse symmetric semigroup $\mathcal{IS}_n$ is calculated.
Keywords: length of a semigroup, inverse semigroup, semigroup, Brandt semigroup. 
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Olexandr Ganyushkin; Ivan Livinsky. Length of the inverse symmetric semigroup. Algebra and discrete mathematics, Tome 12 (2011) no. 2, pp. 64-71. http://geodesic.mathdoc.fr/item/ADM_2011_12_2_a5/

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