Helson and subdiagonal operator algebras

Abstract

This article shows how the work of Henry Helson, especially the two papers of Helson and Lowdenslager, came to influence the development of the theory of non self adjoint operator algebras acting on Hilbert space.

5 pages. This is one of a series of articles memorializing Henry Helson and his work, to appear: Notices AMS, vol. 58, no. 2 (2011)