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dc.contributor.authorJohn O Agure, Paul O Oleche
dc.date.accessioned2020-08-25T09:41:04Z
dc.date.available2020-08-25T09:41:04Z
dc.date.issued2010
dc.identifier.urihttps://repository.maseno.ac.ke/handle/123456789/2357
dc.description.abstractThis paper follows [1] in the quantitative study of Numerical Ranges introduced by Stampfli [9]. In particular, we consider a family of mutually orthogonal projections and investigate how a numerical range can be related to several other numerical ranges in a closed convex hull. We then introduce the centre valued range and show that if U is a W∗- algebra then for any A in U we can relate the norm of A and distance of A itself from its centre.en_US
dc.publisherInt. Journal of Mathen_US
dc.subjectnumerical range, centre valued range, representation, projection, convex hallen_US
dc.titleOn Numerical and Centre Values Rangeen_US
dc.typeArticleen_US


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