Counterexamples concerning topologization of spaces of strongly almost convergent sequences

Authors

  • Enno Kolk University of Tartu

DOI:

https://doi.org/10.12697/ACUTM.1999.03.04

Keywords:

modulus function, sequence space, AK-space, F-seminorm, F-norm, paranorm, strong almos convergence

Abstract

Let λ be a sequence space, f a modulus function, and F=(fk) a sequence of moduli. We characterize the F-normability of the sequence space λ(F) for λ⊂l. In the special case if λ is the space sac0 of strongly almost convergent to zero sequences, we give two counterexamples concerning the topologization of various extensions of sac0(F) and sac0(f) considered by Nanda and others. We also correct a similar inaccuracy in a previous paper of the author.

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Author Biography

Enno Kolk, University of Tartu

Institute of Pure Mathematics

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Published

1999-12-31

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Section

Articles