On uncountable strongly concentrated sets of reals

Bilinsky, Eilon

doi:10.1090/proc/14432

On uncountable strongly concentrated sets of reals
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by Eilon Bilinsky PDF

Proc. Amer. Math. Soc. 149 (2021), 1267-1279 Request permission

Abstract:

We construct new models of ZF with an uncountable set of reals that has a unique condensation point. This addresses a question of Sierpiński from 1918.

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