Su alcune masse fortemente atomiche


In this paper we prove that if \mu is a positive charge on ℕ such that every two-valued charge 𝛽 ≤ \mu determines a principal ultrafilter on ℕ, then for every A⊂ ℕ, the range \mu (P(A)) is a closed set.

DOI Code: 10.1285/i15900932v4n1p87

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