TITLE:
The Unitary Group in Its Strong Topology
AUTHORS:
Martin Schottenloher
KEYWORDS:
Unitary Operator, Strong Operator Topology, Topological Group, Infinite Dimensional Lie Group, Contractibility, Hilbert Bundle, Classifying Space
JOURNAL NAME:
Advances in Pure Mathematics,
Vol.8 No.5,
May
31,
2018
ABSTRACT: The goal of this paper is to confirm that the unitary group U(H) on an infinite dimensional complex Hilbert
space is a topological group in its strong topology,
and to emphasize the importance of this property for applications in topology.
In addition, it is shown that U(H) in its strong topology is metrizable and
contractible if H is separable. As an application Hilbert
bundles are classified by homotopy.