Mathematics – Functional Analysis
Scientific paper
2010-08-31
Mathematics
Functional Analysis
11 pages
Scientific paper
There has been a long-standing conjecture in Banach algebra that every amenable operator is similar to a normal operator. In this paper, we study the structure of amenable operators on Hilbert spaces. At first, we show that the conjecture is equivalent to every non-scalar amenable operator has a non-trivial hyperinvariant subspace and equivalent to every amenable operator is similar to a reducible operator and has a non-trivial invariant subspace; and then, we give two decompositions for amenable operators, which supporting the conjecture.
Ji You Qing
Shi Luo Yi
Wu Yu Jing
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