Some 2-point sets

Tom 208 / 2010

James H. Schmerl Fundamenta Mathematicae 208 (2010), 87-91 MSC: Primary 03E05; Secondary 03C64. DOI: 10.4064/fm208-1-6


Chad, Knight & Suabedissen [Fund. Math. 203 (2009)] recently proved, assuming CH, that there is a $2$-point set included in the union of countably many concentric circles. This result is obtained here without any additional set-theoretic hypotheses.


  • James H. SchmerlDepartment of Mathematics
    University of Connecticut
    Storrs, CT 06269-9003, U.S.A.

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