Geodesic
On the numerical radius of an element of a normed algebra
Glasgow mathematical journal, Tome 15 (1974) no. 1, pp. 90-93

Voir la notice de l'article provenant de la source Cambridge University Press

Let A be a unital normed algebra over the complex field C, A' the dual space of A, i.e., the Banach space of all continuous linear functionals on A, and let S be the set of all states on A, i.e., 
Mocanu, GH. On the numerical radius of an element of a normed algebra. Glasgow mathematical journal, Tome 15 (1974) no. 1, pp. 90-93. doi: 10.1017/S0017089500002214
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