Geodesic
Sums of idempotents in ßN.
Semigroup forum, Tome 44 (1992) no. 1, pp. 107-111.

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Mots-clés : sums of idempotents, Stone-Čech compactification, set of positive integers, topological semigroup, minimal idempotents 
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     author = {J.F. Berglund and N. Hindman},
     title = {Sums of idempotents   in {{\ss}N.}},
     journal = {Semigroup forum},
     pages = {107--111},
     publisher = {mathdoc},
     volume = {44},
     number = {1},
     year = {1992},
     zbl = {0759.22004},
     url = {http://geodesic.mathdoc.fr/item/SF_1992__44_1_135133/}
}
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J.F. Berglund; N. Hindman. Sums of idempotents   in ßN.. Semigroup forum, Tome 44 (1992) no. 1, pp. 107-111. http://geodesic.mathdoc.fr/item/SF_1992__44_1_135133/