Abstract
It is well known that any Vitali set on the real line ℝ does not possess the Baire property. The same is valid for finite unions of Vitali sets. What can be said about infinite unions of Vitali sets? Let S be a Vitali set, S r be the image of S under the translation of ℝ by a rational number r and F = {S r : r is rational}. We prove that for each non-empty proper subfamily F′ of F the union ∪F′ does not possess the Baire property. We say that a subset A of ℝ possesses Vitali property if there exist a non-empty open set O and a meager set M such that A ⊃ O \ M. Then we characterize those non-empty proper subfamilies F′ of F which unions ∪F′ possess the Vitali property.
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Chatyrko, V.A. On countable unions of nonmeager sets in hereditarily Lindelöf spaces. P-Adic Num Ultrametr Anal Appl 3, 1–6 (2011). https://doi.org/10.1134/S2070046611010018
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DOI: https://doi.org/10.1134/S2070046611010018