Geodesic
Jordan Loops and Decompositions of Operators
Canadian journal of mathematics, Tome 29 (1977) no. 5, pp. 1112-1119

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

Let be a separable, infinite dimensional, complex Hilbert space, and let denote the algebra of all bounded linear operators on . In what follows we shall denote the spectrum, essential spectrum, and left essential spectrum of an operator T in , respectively. Furthermore, if and T1 is unitarily equivalent to a compact perturbation of an operator T2, then we write T1~ T2, and if the compact perturbation can be chosen to have norm less than e, we write T1 ~ T2(ε). 
Brown, Arlen; Pearcy, Carl. Jordan Loops and Decompositions of Operators. Canadian journal of mathematics, Tome 29 (1977) no. 5, pp. 1112-1119. doi: 10.4153/CJM-1977-109-8
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