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The Maximal Two-Sided Ideals of Nest Algebras

Journal of Operator Theory, vol. 73:2 (2015), pp. 407-416
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Abstract

We give a necessary and sufficient criterion for an operator in a nest algebra to belong to a proper two-sided ideal of that algebra. Using this result, we describe the strong radical of a nest algebra, and give a general description of the maximal two-sided ideals. This also enables us to provide the final piece in the complete description of epimorphisms of one nest algebra onto another.