English

A Note on UMD Spaces and Transference in Vector-valued Function Spaces

Functional Analysis 2008-02-03 v2

Abstract

We introduce the notion of an ACF space, that is, a space for which a generalized version of M. Riesz's theorem for conjugate functions with values in the Banach space is bounded. We use transference to prove that spaces for which the Hilbert transform is bounded, i\.e\. XHTX\in\text{HT}, are ACF spaces. We then show that Bourgain's proof of XHT    XUMDX\in\text{HT}\implies X\in\text{UMD} is a consequence of this result.

Keywords

Cite

@article{arxiv.math/9406218,
  title  = {A Note on UMD Spaces and Transference in Vector-valued Function Spaces},
  author = {N. Asmar and B. Kelly and Stephen J. Montgomery-Smith},
  journal= {arXiv preprint arXiv:math/9406218},
  year   = {2008}
}