Some 2-point sets
James H. Schmerl
Fundamenta Mathematicae, Tome 209 (2010), p. 87-91 / Harvested from The Polish Digital Mathematics Library
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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.

Publié le : 2010-01-01
EUDML-ID : urn:eudml:doc:283164 
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James H. Schmerl. Some 2-point sets. Fundamenta Mathematicae, Tome 209 (2010) pp. 87-91. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-doi-10_4064-fm208-1-6/