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Now showing items 21-30 of 41
On the norm of elementary operator
(Scientific Research Publishing, 2014-07-07)
The norm of an elementary operator has been studied by many mathematicians. Varied results
have been established especially on the lower bound of this norm. Here, we attempt the same
problem for finite dimensional operators.
On the Numerical Range of a Generalized Derivation
(HIKARI Ltd,, 2017)
We examine the relationship between the numerical range of the
restriction of a generalized derivation to a norm ideal J and that of its
implementing elements.
Mathematics Subject Classi cation: 47A12; 47B47
Orthogonality of elementary operators in normed spaces and their applications
(SAMSA 2012 mathematics conference proceedings, 2012-11)
Malaria is a major public health concern, especially among
pregnant women and children under the age of five. It is a leading cause
of morbidity and mortality in Malawi, accounting for fourty percent
of out-patient ...
Deficiency indices and spectrum of fourth order difference equations with unbounded coefficients
(WILEY‐VCH Verlag, 2013-03)
Using subspace theory together with appropriate smoothness and decay conditions, we calculated the deficiency indices and absolutely continuous spectrum of fourth order difference equations with unbounded coefficients. In ...
A Functional Calculus for (α, α+ 1)− type R Operators
(Int. Journal of Math. Analysis,, 2010)
A closed densely defined operator H, on a Banach space X, whose
spectrum is contained in R and satisfies
(z − H)−1
≤ c
z α
| z|β
∀ z ∈ R with z α :=
|z|2 + 1 (1)
for some α , β ≥ 0; c > 0, is said to ...
Aspects of (pq) summing multipliers
(Vdm verlag Dr. Muller aktiengeselischaft & co. kg., 2010)
A sequence (uj)j2N of operators in L(X; Y ) is a (p; q)-summing multi-
plier (or (p; q)-summing sequence of operators), in short (uj) 2 `¼p;q (X; Y ), if there
exists a constant C > 0 such that, for any ¯nite collection ...
Norms of Inner Derivations on Norm ideals
(Int. Journal of Math. Analysis, 2010)
Let B(H) be the algebra of bounded linear operators on a Hilbert
space H and J be a norm ideal in B(H). We investigate the relationship
between the diameter of the numerical range of an operator A ∈ B(H)
and the norm ...
Norm of a derivation and hyponormal operators
(Int J Math Anal, 2010)
We characterize when the norm of inner derivation on a norm ideal
equals that on the quotient algebra. We further investigate norms of
inner derivations implemented by normal and hyponormal operators on
norm ...
A cost - benefit analysis of substituting bamboo for tobacco: a case study of smallholder tobacco farmers in south Nyanza, Kenya
(Science Journal Publication, 2012)
This study examined the economic and financial benefits and costs of
farming bamboo as a crop substitute of tobacco in four (4) districts in South
Nyanza, Kenya. The World Health Organization Framework Convention on ...
Combinatorics of oriented trees and tree-like structures
(Stellenbosch University, 2015)
In this thesis, a number of combinatorial objects are enumerated. Du and
Yin as well as Shin and Zeng (by a different approach) proved an elegant
formula for the number of labelled trees with respect to a given ...