Browsing School of Mathematics, Statistics and Actuarial Science by Author "CYPRIAN, Omukhwaya Sakwa"

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    • On Joint Essential Numerical Ranges 

      CYPRIAN, Omukhwaya Sakwa (Maseno University, 2013)
      The concept of numerical range on a Hilbert space was first introduced by O. Toeplitz in 1918 for matrices. This notion was independently ex tended by G. Lumer and F. Bauer in the sixties on finite dimensional Banach ...