English

On characterizations of a some classes of Schauder frames in Banach spaces

Functional Analysis 2023-07-19 v1

Abstract

In this paper, we prove the following results. There exists a Banach space without basis which has a Schauder frame. There exists an universal Banach space BB (resp. B~\tilde{B}) with a basis (resp. an unconditional basis) such that, a Banach XX has a Schauder frame (resp. an unconditional Schauder frame ) if and only if XX is isomorphic to a complemented subspace of BB (resp. B~\tilde{B}). For a weakly sequentially complete Banach space, a Schauder frame is unconditional if and only if it is besselian. A separable Banach space XX has a Schauder frame if and only if it has the bounded approximation property. Consequenty, The Banach space L(H,H)\mathcal{L}(\mathcal{H},\mathcal{H}) of all bounded linear operators on a Hilbert space H\mathcal{H} has no Schauder frame. Also, if XX and YY are Banach spaces with Schauder frames then, the Banach space X^πY X\widehat{\otimes}_{\pi}Y (the projective tensor product of XX and YY) has a Schauder frame. From the Faber-Schauder system we construct a Schauder frame for the Banach space C[0,1]C[0,1] (the Banach space of continuous functions on the closed interval [0,1] [0,1]) which is not a Schauder basis of C[0,1]C[0,1]. Finally, we give a positive answer to some open problems related to the Schauder bases (In the Schauder frames setting).

Keywords

Cite

@article{arxiv.2307.09174,
  title  = {On characterizations of a some classes of Schauder frames in Banach spaces},
  author = {Rafik Karkri and Samir Kabbaj and Hamad Sidi Lafdal},
  journal= {arXiv preprint arXiv:2307.09174},
  year   = {2023}
}