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math.LO2026
A nonmicroscopic set with only microscopic compact subsets
Martin Doležal, Václav Vlasák
We construct a nonmicroscopic subset of the real line all of whose compact subsets are microscopic, answering a question of Zindulka and Nowakowski. We first obtain such a se…
math.LO2015
Perfect independent sets with respect to infinitely many relations
Martin Doležal, Wiesław Kubiś
We prove a result on perfect cliques with respect to countably many G-delta relations on a complete metric space. As an application, we show that a Polish group contains a free sub…