MathSciNet bibliographic data MR1072795 20M99 (11B25 54D35 54H20) Hindman, Neil The semigroup $\beta{\bf N}$$\beta{\bf N}$ and its applications to number theory. The analytical and topological theory of semigroups, 347–360, De Gruyter Exp. Math., 1, de Gruyter, Berlin, 1990. Links to the journal or article are not yet available

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