| dc.contributor.author | John O Agure, Paul O Oleche | |
| dc.date.accessioned | 2020-08-25T09:41:04Z | |
| dc.date.available | 2020-08-25T09:41:04Z | |
| dc.date.issued | 2010 | |
| dc.identifier.uri | https://repository.maseno.ac.ke/handle/123456789/2357 | |
| dc.description.abstract | This 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.publisher | Int. Journal of Math | en_US |
| dc.subject | numerical range, centre valued range, representation, projection, convex hall | en_US |
| dc.title | On Numerical and Centre Values Range | en_US |
| dc.type | Article | en_US |
