Irreducible Compact Operators.

Ben de Pagter

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Direct sums of irreducible operators

Jun Shen Fang, Chun-Lan Jiang, Pei Yuan Wu (2003)

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It is known that every operator on a (separable) Hilbert space is the direct integral of irreducible operators, but not every one is the direct sum of irreducible ones. We show that an operator can have either finitely or uncountably many reducing subspaces, and the former holds if and only if the operator is the direct sum of finitely many irreducible operators no two of which are unitarily equivalent. We also characterize operators T which are direct sums of irreducible operators in...