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Published in 2020 at "Mathematica Slovaca"
DOI: 10.1515/ms-2017-0379
Abstract: Abstract Let x = {xn}n=1∞ $\begin{array}{} \displaystyle \{x_n\}_{n=1}^{\infty} \end{array}$ be a sequence of positive numbers, and ????x be the collection of all subsets A ⊆ ℕ such that ∑k∈A $\begin{array}{} \displaystyle \sum_{k\in A} \end{array}$ xk…
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Keywords:
summable subsequences;
begin array;
sequence;
density summable ... See more keywords