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Nearly equivalent operators

Sadoon Ibrahim Othman — 1996

Mathematica Bohemica

The properties of the bounded linear operators $T$ on a Hilbert space which satisfy the condition $T T^{*} = U^{*} T^{*} T U$ where $U$ is unitary, are studied in relation to those of normal, hyponormal, quasinormal and subnormal operators.

Convex Compactness Property in Certain Spaces of Measures.

Singh Surjit Khurana; Sadoon Ibrahim Othman

Mathematische Annalen

Biharmonic Green domains in a Riemannian manifold

Sadoon Ibrahim Othman; Victor Anandam — 2003

Commentationes Mathematicae Universitatis Carolinae

Let $R$ be a Riemannian manifold without a biharmonic Green function defined on it and $Ω$ a domain in $R$ . A necessary and sufficient condition is given for the existence of a biharmonic Green function on $Ω$ .

Completeness and sequential completeness in certain spaces of measures

Surjit Singh Khurana; Sadoon Ibrahim Othman — 1995

Mathematica Slovaca

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