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Reiner Berntzen (1996)
Studia Mathematica
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The problem of approximation by accretive elements in a unital C*-algebra suggested by P. R. Halmos is substantially solved. The key idea is the observation that accretive approximation can be regarded as a combination of positive and self-adjoint approximation. The approximation results are proved both in the C*-norm and in another, topologically equivalent norm.
Fernando Cobos (1988)
Colloquium Mathematicae
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J. Prasad (1972)
Publications de l'Institut Mathématique [Elektronische Ressource]
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Hans-Jürgen Schmeisser, Winfried Sickel (1989)
Banach Center Publications
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Tulsi Dass Narang (1986)
Archivum Mathematicum
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R. Taberski (1977)
Annales Polonici Mathematici
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Jiři Močkoř (1975)
Colloquium Mathematicae
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W. Odyniec, M. P. Prophet (2008)
Banach Center Publications
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In this report we discuss the applications of the strong unicity constant and highlight its use in the minimal projection problem.
P. L. Papini (1987)
Matematički Vesnik
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