ON THE CONVEXITY OF THE JOINT ESSENTIAL NUMERICAL RANGES

  • O. S. CYPRIAN
  • ANDREW MASIBAYI
  • N. B. OKELO
DOI: https://doi.org/10.53555/m.v1i1.2399

Abstract

The concept of essential numerical range of an operator was defined and studied by Stampfli
and Williams in 1972. In this paper, we consider the joint essential numerical range of an mtuple of operators T = (

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Author Biographies

O. S. CYPRIAN

KIBABII UNIVERSITY COLLEGE
BOX 1699-50200, BUMGOMA

ANDREW MASIBAYI

KIBABII UNIVERSITY COLLEGE
BOX 1699-50200, BUMGOMA

N. B. OKELO

SCHOOL OF MATHEMATICS AND ACTUARIAL SCIENCE,
JARAMOGI OGINGA ODINGA UNIVERSITY OF SCIENCE AND TECHNOLOGY,
P. O. BOX 210-40601, BONDO-KENYA

Published
2015-05-31
How to Cite
CYPRIAN, O. S., MASIBAYI, A., & OKELO, N. B. (2015). ON THE CONVEXITY OF THE JOINT ESSENTIAL NUMERICAL RANGES. IJRDO -JOURNAL OF MATHEMATICS, 1(1), 23-28. https://doi.org/10.53555/m.v1i1.2399
Issue
Vol. 1 No. 1 (2015): IJRDO-Journal of Mathematics
Section
Articles

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