Abstract
We extend a determinant inequality of Fiedler and Markham [On a theorem of Everitt, Thompson, and de Pillis, Math Slovaca, 44 (1994), 441–444] to the class of matrices whose numerical range is contained in a sector. Moreover, some related results are also included.
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Acknowledgements
The author is grateful to the referee for numerous suggestions which improve the presentation.
Notes
No potential conflict of interest was reported by the author.