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Abstract
We give a characterization of binormal operator matrices, and in particular, a description of binormal Toeplitz matrices for
. Non-trivial examples of binormal matrices that are not normal are also provided.
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Acknowledgements
The authors wish to thank the referees for their invaluable comments on the original draft.
Notes
No potential conflict of interest was reported by the authors.
Additional information
Funding
The first author was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education [grant number 2009-0093827]. The third author was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science, and Technology [grant number 2016R1A2B4007035].