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Published online by Cambridge University Press: 20 November 2018
We are well-acquainted with the theorem about sequences which states that, the existence of
(1)
is sufficient to imply limk→∞ak = 0. Partially out of a growing interest in the theory of regularly varying sequences ([1]), and probably as an interesting problem, in and of itself, some mathematicians have tried to find conditions weaker than (1) that would guarantee limk→∞ak = 0.