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A note on classes of structured matrices with elliptical type numerical range

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Abstract

We identify new classes of structured matrices whose numerical range is of the elliptical type, that is, an elliptical disk or the convex hull of elliptical disks.

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Authors and Affiliations

  1. Mathematics Center of the University of Coimbra, Mathematics Department, University of Coimbra, 3001-454, Coimbra, Portugal

    Natália Bebiano

  2. Center for Functional Analysis, Linear Structures and Applications, Faculty of Economics, University of Porto, Rua Dr. Roberto Frias, 4200-464, Porto, Portugal

    Susana Furtado

Authors
  1. Natália Bebiano
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  2. Susana Furtado
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Corresponding author

Correspondence to Susana Furtado.

Additional information

This work was partially supported by project UID/MAT/00324/2019 and by project UID/MAT/04721/2020.

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Bebiano, N., Furtado, S. A note on classes of structured matrices with elliptical type numerical range. Czech Math J 71, 1015–1023 (2021). https://doi.org/10.21136/CMJ.2021.0174-20

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  • DOI: https://doi.org/10.21136/CMJ.2021.0174-20

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