Quartically hyponormal weighted shifts need not be 3-hyponormal

arxiv: math/0610887 · v1 · pith:6IIA6IKMnew · submitted 2006-10-28 · 🧮 math.FA · math.OA

Raul E. Curto , Sang Hoon Lee This is my paper

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keywords hyponormalquarticallyweightedexamplefirstgiveneedshift

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We give the first example of a quartically hyponormal unilateral weighted shift which is not 3-hyponormal.

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