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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DOI

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. 
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
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