On a problem of V. Pták
Ivan Korec (1978)
Časopis pro pěstování matematiky
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Ivan Korec (1978)
Časopis pro pěstování matematiky
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Zhongxue, Lü, Hongzheng, Xie (2007)
Journal of Inequalities and Applications [electronic only]
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Ladislav Mišík, János T. Tóth (2003)
Journal de théorie des nombres de Bordeaux
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In the paper sufficient conditions for the -density of a set of positive integers in terms of logarithmic densities are given. They differ substantially from those derived previously in terms of asymptotic densities.
František Púchovský (1976)
Mathematica Slovaca
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