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    • On the Banach algebra numerical range 

      Kaubya, Francis; Agure, John Ogonji; Emenyu, John (Strathmore University, 2017)
      Let A denote a unital Banach algebra and SA denote its unit sphere. It was proved by F. F. Bonsalland J. Duncan that when the Banach algebra is unital, the algebra numerical rangeis identical to a subset of itself. Basing ...
    • On the Banach algebra numerical range 

      Kaubya, Francis (Strathmore University, 2017)
      Let A denote a unital Banach algebra and SA denote its unit sphere. It was proved by F. F. Bonsall and J. Duncan that when the Banach algebra is unital, the algebra numerical range is identical to a subset of itself. Basing ...