Geodesic
Ultrafilters on a discrete set with two binary operations.
Semigroup forum, Tome 43 (1991) no. 3, pp. 77-82.

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Mots-clés : Stone-Čech compactification, compact semigroup, minimal two-sided ideal, syndetic 
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     author = {A.T. Lisan},
     title = {Ultrafilters on a discrete set with two binary operations.},
     journal = {Semigroup forum},
     pages = {77--82},
     publisher = {mathdoc},
     volume = {43},
     number = {3},
     year = {1991},
     zbl = {0723.22003},
     url = {http://geodesic.mathdoc.fr/item/SF_1991__43_3_135097/}
}
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A.T. Lisan. Ultrafilters on a discrete set with two binary operations.. Semigroup forum, Tome 43 (1991) no. 3, pp. 77-82. http://geodesic.mathdoc.fr/item/SF_1991__43_3_135097/