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Browsing by Subject "Closed subsets"

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    • On the envelope of some classes of 3 by 3 matrices 

      Aretaki A., Chorianopoulos C. (2022)
      The envelope of a square complex matrix is a closed and bounded subset of the numerical range which contains the spectrum. We study the envelope of special classes of 3×3 matrices such as the nilpotent and the unitarily ...