Quartically hyponormal weighted shifts need not be 3-hyponormal

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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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Functional Analysis, Operator Algebras, 47B20; 47B37; 47A13

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http://salesiana.dossiersoluciones.com/handle/123456789/118162

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/math/0610887
 http://arxiv.org/abs/math/0610887
 J. Math. Anal. Appl. 314(2006), 455-463

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arXiv