MathSciNet bibliographic data MR539649 (80f:05005) 05A17 (10A45 54D40) Hindman, Neil Simultaneous idempotents in $\beta {\bf N}\sbs{\bf N}$$\beta {\bf N}\sbs{\bf N}$ and finite sums and products in $N$$N$. Proc. Amer. Math. Soc. 77 (1979), no. 1, 150–154. Article

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