Geodesic
Extreme points of the closed unit ball in C*-algebras
Colloquium Mathematicum, Tome 74 (1997) no. 1, pp. 99-100.

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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.
DOI : 10.4064/cm-74-1-99-100

Rainer Berntzen 1

1 
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Rainer Berntzen. Extreme points of the closed unit ball in C*-algebras. Colloquium Mathematicum, Tome 74 (1997) no. 1, pp. 99-100. doi : 10.4064/cm-74-1-99-100. http://geodesic.mathdoc.fr/articles/10.4064/cm-74-1-99-100/

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