Geodesic
Lifting sets and the Calkin algebra
Glasgow mathematical journal, Tome 23 (1982) no. 1, pp. 83-84

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

H will denote a Hilbert space of infinite dimension, B(H) the algebra of bounded linear operators on H, and R(H) the ideal of compact operators on H. We let σ, σe and σω denote the spectrum, essential spectrum and Weyl spectrum respectively. It is well known that for arbitrary T ∈ B(H) we have by [5]andand 
Murphy, G. J. Lifting sets and the Calkin algebra. Glasgow mathematical journal, Tome 23 (1982) no. 1, pp. 83-84. doi: 10.1017/S0017089500004808
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