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    • Families of Increasing Sequences Possessing the Harmonic Series Property 

      Wituła, Roman; Hetmaniok, Edyta; Słota, Damian (Łódź University Press, 2013)
      We prove in this paper that any maximal, with respect to inclusion, subset of N – the family of all increasing sequences of positive integers – possessing the harmonic series property has the cardinality of the ...