Geodesic
Nearly prime subsemigroups of ßN.
Semigroup forum, Tome 51 (1995) no. 1, pp. 299-318.

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Mots-clés : special divisibly strongly summable, divisible, compact subsemigroup, ultrafilters, maximal ultrafilters, strongly summable, divisibly strongly summable 
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     author = {N. Hindman and D. Strauss},
     title = {Nearly prime subsemigroups of  {{\ss}N.}},
     journal = {Semigroup forum},
     pages = {299--318},
     publisher = {mathdoc},
     volume = {51},
     number = {1},
     year = {1995},
     zbl = {0843.22005},
     url = {http://geodesic.mathdoc.fr/item/SF_1995__51_1_135418/}
}
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N. Hindman; D. Strauss. Nearly prime subsemigroups of  ßN.. Semigroup forum, Tome 51 (1995) no. 1, pp. 299-318. http://geodesic.mathdoc.fr/item/SF_1995__51_1_135418/