Publications

2010

WANAMBISI, MRWAFULAATHURW.  2010.  Invariance of numerical range under isometric transformation. African Journal Of Mathematics and Computer Science Research. : Academic Journals Abstract
In this paper,we look at some properties of isometries and conditionsfor a quasi-affinity to be unitary.Among other results it is proved that if Ais a partial isometry such that if zero belongs to the numerical range of A or its positve integral powers then A is unitary
WANAMBISI, MRWAFULAATHURW.  2010.  Norm Properties of Operators Who's norms are Eigenvalues. African Journal of Mathematics and Computer Science Research. : Academic Journals Abstract
In this paper we present preperties of a norm attaining operator on a Hilbertspace .We show that if T is norm attaining then it satisfies the generalized Daugavet condion

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