Finite rank operators in Lie ideals of nest algebras

Details Finite rank operators in Lie ideals of nest algebras Finite rank operators in Lie ideals of nest algebras

2010-01-19

arxiv.org/abs/1001.3269v2

Mathematics

Operator Algebras

17 pages; definitions missing in the previous version are now added at the beginning of Section 3 (page 3); results unchanged

Scientific paper

The main theorem provides a characterisation of the finite rank operators lying in a norm closed Lie ideal of a continuous nest algebra. These operators are charaterised as those finite rank operators in the nest algebra satisfying a condition determined by a left order continuous homomorphism on the nest. A crucial fact used in the proof of this theorem is the decomposability of the finite rank operators. One shows that a finite rank operator in a norm closed Lie ideal of a continuous nest algebra can be written as a finite sum of rank one operators lying in the ideal.

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