English

On a question of Haskell P. Rosenthal

Functional Analysis 2007-05-23 v1

Abstract

We consider a normalized basis in a Banach space with the following property: any normalized block sequence of the basis has a subsequence equivalent to the basis. We show that under uniformity or other natural assumptions, a basis with this property is equivalent to the unit vector basis of c0c_0 or p\ell_p. We also address an analogous problem for spreading models.

Keywords

Cite

@article{arxiv.math/0212166,
  title  = {On a question of Haskell P. Rosenthal},
  author = {Valentin Ferenczi and Anna Maria Pelczar and Christian Rosendal},
  journal= {arXiv preprint arXiv:math/0212166},
  year   = {2007}
}

Comments

14 pages

R2 v1 2026-07-22T16:50:13.979Z