A note on cubically hyponormal weighted shifts
Bull. Korean Math. Soc. 2014 Vol. 51, No. 4, 1031-1040
https://doi.org/10.4134/BKMS.2014.51.4.1031
Published online July 1, 2014
Chunji Li, Muneo Ch\={o}, and Mi Ryeong Lee
Northeastern University, Kanagawa University, Catholic University of Daegu
Abstract : In this paper, we show that any cubically hyponormal weighted shift with first two equal weights is flat. And we give an example of a weighted shift which is not cubically hyponormal but almost-cubically hyponormal.
Keywords : weighted shift, cubically hyponormal operator, flatness
MSC numbers : Primary 47B37; Secondary 47B20
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