Geodesic
Strongly summable ultrafilters on N and small maximal subgroups of ßN.
Semigroup forum, Tome 42 (1991) no. 3, pp. 63-76.

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Mots-clés : Stone-Čech compactification, compact semigroups, idempotents, consistent, strongly summable ultrafilters, ZFC 
@article{SF_1991__42_3_135065,
     author = {N. Hindman},
     title = {Strongly summable ultrafilters on {N} and small maximal subgroups of {{\ss}N.}},
     journal = {Semigroup forum},
     pages = {63--76},
     publisher = {mathdoc},
     volume = {42},
     number = {3},
     year = {1991},
     zbl = {0716.22002},
     url = {http://geodesic.mathdoc.fr/item/SF_1991__42_3_135065/}
}
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N. Hindman. Strongly summable ultrafilters on N and small maximal subgroups of ßN.. Semigroup forum, Tome 42 (1991) no. 3, pp. 63-76. http://geodesic.mathdoc.fr/item/SF_1991__42_3_135065/