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Quartically hyponormal weighted shifts need not be 3-hyponormal
Authors:Raú  l E. Curto,Sang Hoon Lee
Affiliation:Department of Mathematics, The University of Iowa, Iowa City, IA 52242, USA
Abstract:We give the first example of a quartically hyponormal unilateral weighted shift which is not 3-hyponormal.
Keywords:k-Hyponormal   Weakly k-hyponormal   Weighted shift
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