Geodesic
Characterizations of commutativity for C*-algebras
Glasgow mathematical journal, Tome 15 (1974) no. 2, pp. 172-175

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

Let be a C*-algebra acting on the Hilbert space H and let be the self-adjoint elements of . The following characterization of commutativity is due to I. Kaplansky (see Dixmier [3, p. 58]). 
Crabb, M. J.; Duncan, J.; McGregor, C. M. Characterizations of commutativity for C*-algebras. Glasgow mathematical journal, Tome 15 (1974) no. 2, pp. 172-175. doi: 10.1017/S0017089500002378
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