Asymptotic density of A⊂ ℕ and density of the ratio set R(A)

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Mathematical Institute of the Slovak Academy of Sciences, Štefánikova 49, SK-814 73 Bratislava, Slovakia
Department of Mathematics of the Faculty of Natural Sciences, Constantine the Philosopher University in Nitra, Tr. A. Hlinku 1, SK-949 74 Nitra, Slovakia

positive integers, subset, ratio set, asymptotic density

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