Concrete realizations of quotients of operator spaces
Operator Algebras
2014-06-12 v2
Abstract
Let B be a unital C*-subalgebra of a unital C*-algebra A, so that A/B is an abstract operator space. We show how to realize A/B as a concrete operator space by means of a completely contractive map from A into the algebra of operators on a Hilbert space, of the form a maps to [z, a] where z is a Hermitian unitary operator. We do not use Ruan's theorem concerning concrete realization of abstract operator spaces. Along the way we obtain corresponding results for abstract operator spaces of the form A/V where V is a closed subspace of A, and then for the more special cases in which V is a *-subspace or an operator system.
Keywords
Cite
@article{arxiv.1101.3012,
title = {Concrete realizations of quotients of operator spaces},
author = {Marc A. Rieffel},
journal= {arXiv preprint arXiv:1101.3012},
year = {2014}
}
Comments
12 pages. Version 2: Short section added concerning quotients of operator systems. Various small improvements made