Browsing Journal Articles by Author "0869d6c2-3503-4aa1-b978-51af7e49fbb9"

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    • On Norm of Elementary Operator: An Application of Stampfli’s Maximal Numerical Range 

      Kingangi, Denis Njue (Pure and Applied Mathematics Journal, 2018-03)
      Many researchers in operator theory have attempted to determine the relationship between the norm of an elementary operator of finite length and the norms of its coefficient operators. Various results have been obtained ...

    • On the Numerical Ranges 

      Kingangi, Denis Njue (International Journal of Scientific and Innovative Mathematical Research (IJSIMR), 2015-08)
      Properties of operators in a C*-algebra B(H) have been studied by many researchers in operator theory. This paper is an investigation of the numerical ranges of operators in B(H) . We show that zero is in the algebraic ...