Extreme points of the closed unit ball in C*-algebras

• Autorzy: Rainer Berntzen
• Języki publikacji: EN

Abstrakty

EN

In this short note we give a short and elementary proof of a characterization of those extreme points of the closed unit ball in C*-algebras which are unitary. The result was originally proved by G. K. Pedersen using some methods from the theory of approximation by invertible elements.

• Wydawca: Institute of Mathematics Polish Academy of Sciences
• Czasopismo: Colloquium Mathematicum
• Rocznik: 1997
• Tom: 74
• Numer: 1
• Strony: 99-100

Daty

wydano

1997

otrzymano

1996-12-02

Twórcy

autor

Rainer Berntzen

• Mathem. Institut der WWU Münster, Einsteinstr. 62, 48149 Münster, Germany

Bibliografia

• [Kad] R. V. Kadison, Isometries of operator algebras, Ann. of Math. 54 (1951), 325-338.
• [Pe1] G. K. Pedersen, C*-Algebras and Their Automorphism Groups, London Math. Soc. Monographs 13, Academic Press, London, 1979.
• [Pe2] G. K. Pedersen, The λ-function in operator algebras, J. Operator Theory 26 (1991), 345-382.