MathSciNet bibliographic data MR358695 54D35 Hindman, Neil Preimages of points under the natural map from $\beta (N\times N)$$\beta (N\times N)$ to $\beta N\times \beta N$$\beta N\times \beta N$. Proc. Amer. Math. Soc. 37 (1973), 603–608. Article

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