Lie Ideals in Operator Algebras

Details Lie Ideals in Operator Algebras Lie Ideals in Operator Algebras

2002-11-21

arxiv.org/abs/math/0211347v1

Mathematics

Operator Algebras

LaTeX; approx. 18 pages

Scientific paper

Let $\mathcal A$ be a Banach algebra for which the group of invertible elements is connected. A subspace $\mathcal L \subseteq \mathcal A$ is a Lie ideal in $\mathcal A$ if, and only if, it is invariant under inner automorphisms. This applies, in particular, to any canonical subalgebra of an AF \ensuremath{\text{C}^{*}}-algebra. The same theorem is also proven for strongly closed subspaces of a totally atomic nest algebra whose atoms are ordered as a subset of the integers and for CSL subalgebras of such nest algebras. We also give a detailed description of the structure of a Lie ideal in any canonical triangular subalgebra of an AF \ensuremath{\text{C}^{*}}-algebra.

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