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2005 | 187 | 2 | 111-126
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Discrete n-tuples in Hausdorff spaces

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We investigate the following three questions: Let n ∈ ℕ. For which Hausdorff spaces X is it true that whenever Γ is an arbitrary (respectively finite-to-one, respectively injective) function from ℕⁿ to X, there must exist an infinite subset M of ℕ such that Γ[Mⁿ] is discrete? Of course, if n = 1 the answer to all three questions is "all of them". For n ≥ 2 the answers to the second and third questions are the same; in the case n = 2 that answer is "those for which there are only finitely many points which are the limit of injective sequences". The answers to the remaining instances involve the notion of n-Ramsey limit. We also show that the class of spaces satisfying these discreteness conclusions for all n includes the class of F-spaces. In particular, it includes the Stone-Čech compactification of any discrete space.
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  • Department of Mathematics, Ohio State University, Columbus, OH 43210, U.S.A.
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  • Department of Mathematics, Howard University, Washington, DC 20059, U.S.A.
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  • Department of Pure Mathematics, University of Hull, Hull HU6 7RX, UK
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bwmeta1.element.bwnjournal-article-doi-10_4064-fm187-2-2
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