Results 51 to 60 of about 94 (89)

A characterization of the class of partial isometries

Linear Algebra and its Applications, 2012
Let \(S\) be a self-adjoint invertible operator acting on a Hilbert space. The Corach-Porta-Recht inequality states that \(\|SXS^{-1} + S^{-1}XS\| \geq 2\|X\|\) holds true for every bounded linear operator~\(X\). Several authors have considered the case of equality and, more generally, characterized subclasses of normal operators by inequalities or ...
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On partial isometries with no isometric part [PDF]

Pacific Journal of Mathematics, 1976
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Ordered $*$-Semigroups and a $C^*$-Correspondence for a Partial Isometry

, 2013
Certain $*$-semigroups are associated with the universal $C^*$-algebra generated by a partial isometry, which is itself the universal $C^*$-algebra of a $*$-semigroup. A fundamental role for a $*$-structure on a semigroup is emphasized, and ordered and matricially ordered $*$-semigroups are introduced, along with their universal $C^*$-algebras.
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Decomposition theorems for partial isometries

Journal of Mathematical Analysis and Applications, 1970
Erdelyi, I, Miller, F.R
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On partial isometries

Proceedings of the Japan Academy, Series A, Mathematical Sciences, 1977
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Semigroups of partial isometries [PDF]

Bulletin of the American Mathematical Society, 1969
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Decomposition of Semi-Groups of Partial Isometries [PDF]

Indiana University Mathematics Journal, 1970
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Partial isometries on Banach spaces

, 2005
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Restrictions of partial isometries II

Periodica Mathematica Hungarica, 1992
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Z Sebestyén
exaly   +2 more sources

On a Generalization of Partial Isometries in Banach Spaces

Georgian Mathematical Journal, 2008
Abstract This paper is concerned with the definition and study of semipartial isometries on Banach spaces. This class of operators, which is a natural generalization of partial isometries from Hilbert to general Banach spaces, contains in particular the class of partial isometries recently introduced by M. Mbekhta [Acta Sci.
Mohamed Aziz Taoudi
exaly   +3 more sources