Geodesic
A Short Proof of Vladimirskii′s Theorem on Precompact Perturbations in Locally Convex Spaces
Canadian mathematical bulletin, Tome 18 (1975) no. 5, pp. 649-655

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

Let T, P denote two continuous operators from E into F, where E and F are locally convex spaces. It is proved by L. Schwartz [8] and G. KÖthe [6] that if E and F are Fréchet spaces, T is a φ_-operator and P a compact operator, then T+P is a φ_-operator. 
Chu, Le Quang. A Short Proof of Vladimirskii′s Theorem on Precompact Perturbations in Locally Convex Spaces. Canadian mathematical bulletin, Tome 18 (1975) no. 5, pp. 649-655. doi: 10.4153/CMB-1975-114-5
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