Korean J. Math. Vol. 20 No. 4 (2012) pp.485-491
DOI: https://doi.org/10.11568/kjm.2012.20.4.485

ON THE NORM ATTAINING OPERATORS

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Published: Dec 30, 2012

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Jun Ik Lee

Abstract

In this paper, we show the norm attaining paranormal
operators have a nontrivial invariant subspace. Also, we show the
norm attaining quadratically hyponormal weighted shift is subnor-
mal.



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