Geodesic
Isolated subsemigroups in the variants of T n
Acta mathematica Universitatis Comenianae, Tome 77 (2008) no. 1 
V. Mazorchuk; G. Tsyaputa. Isolated subsemigroups in the variants of T n. Acta mathematica Universitatis Comenianae, Tome 77 (2008) no. 1. http://geodesic.mathdoc.fr/item/AMUC_2008_77_1_a6/
@article{AMUC_2008_77_1_a6,
     author = {V. Mazorchuk and G. Tsyaputa},
     title = {Isolated subsemigroups in the variants of {T} n},
     journal = {Acta mathematica Universitatis Comenianae},
     year = {2008},
     volume = {77},
     number = {1},
     url = {http://geodesic.mathdoc.fr/item/AMUC_2008_77_1_a6/}
}
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Voir la notice de l'article provenant de la source Comenius University

We classify all isolated, completely isolated and convex subsemigroups in the semigroup Tn of all transformations of an n -element set, considered as the semigroup with respect to a sandwich operation. <br><B>Keywords</b>:&nbsp; mean value property; harmonic function; ellipsoid; prolate spheroid.