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Functions Preserving Some Types of Series

  • J. Borsík
Published/Copyright: June 9, 2010

Abstract

Let A and B be sets of real sequences. Let F(A, B) denote the set of all functions ƒ : ℝ → ℝ that preserve A and B in the sense that (ƒ(an)) ∈ B for all sequences (an) ∈ A. We characterize F(A, B) when A and B are convergent series, absolutely convergent series, relatively convergent series and divergent series.

Received: 2006-12-07
Revised: 2008-04-24
Published Online: 2010-06-09
Published in Print: 2008-December

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