Geodesic
In a left-topological semigroup with dense center the closure of any left ideal is an ideal.
Semigroup forum, Tome 36 (1987), pp. 247-248.

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

Mots-clés : Stone-Čech compactification, Ellis compactification, abelian semitopological semigroup, ideal 
@article{SF_1987__36_134899,
     author = {W. Ruppert},
     title = {In a left-topological semigroup with dense center the closure of any left ideal is an ideal.},
     journal = {Semigroup forum},
     pages = {247--248},
     publisher = {mathdoc},
     volume = {36},
     year = {1987},
     zbl = {0623.22004},
     url = {http://geodesic.mathdoc.fr/item/SF_1987__36_134899/}
}
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W. Ruppert. In a left-topological semigroup with dense center the closure of any left ideal is an ideal.. Semigroup forum, Tome 36 (1987), pp. 247-248. http://geodesic.mathdoc.fr/item/SF_1987__36_134899/