H. Raubenheimer
University of Johannesburg
34 Papers
131 Citations
H. Raubenheimer is an academic researcher from University of Johannesburg. The author has contributed to research in topics: Spectrum (functional analysis) & Banach *-algebra. The author has an hindex of 8, co-authored 30 publications. Previous affiliations of H. Raubenheimer include University of the Free State & University of Pretoria.
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Papers
More Spectral Theory in Ordered Banach Algebras
S. Mouton,H. Raubenheimer +1 more
TL;DR: In this article, a spectral theory for positive elements in an ordered Banach algebra is presented, where a suitable version of the Krein-Rutman theorem and a characterisation of positive quasi-inessential elements are provided.
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Spectral properties of elements in different Banach algebras
J. J. Grobler,H. Raubenheimer +1 more
TL;DR: In this article, Grobler et al. considered the question of how the spectrum relative to B of an element in B relates to the spectrum of the element relative to A in B and showed that if B is semi-simple and closed in A, the embedding of B into A is continuous.
Ruston elements and fredholm theory relative to arbitrary homomorphisms
TL;DR: In this paper, the theory of almost Ruston elements and spectra relative to an arbitrary homomorphism has been extended by extending some of the Fredholm theory by introducing the concept of almost-Ruston elements.
On regularities and Fredholm theory
L. Lindeboom,H. Raubenheimer +1 more
TL;DR: In this paper, the authors investigated the relationship between the regularities and the Fredholm theory in a Banach algebra, and showed that the relation is not limited to regularities.