Abstract
AbstractWe consider classes of subsets of [0, 1], originally introduced by Falconer, that are closed under countable intersections, and such that every set in the class has Hausdorff dimension at least s. We provide a Frostman-type lemma to determine if a limsup set is in such a class. Suppose that E = lim sup En ⊂ [0, 1], and that μn are probability measures with support in En. If there exists a constant C such thatfor all n, then, under suitable conditions on the limit measure of the sequence (μn), we prove that the set E is in the class .As an application we prove that, for α > 1 and almost all λ ∈ (½, 1), the setwhere and ak ∈ {0, 1}}, belongs to the class . This improves one of our previously published results.
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