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Sur la conorme essentielle

Mostafa MbekhtaRodolphe Paul — 1996

Studia Mathematica

Pour un opérateur T borné sur un espace de Hilbert dans lui-même, nous montrons que γ ( π ( T ) ) = s u p γ ( T + K ) : K o p é r a t e u r c o m p a c t , où γ est la conorme (the reduced minimum modulus) et π(T) est la classe de T dans l’algèbre de Calkin. Nous montrons aussi que ce supremum est atteint. D’autre part, nous montrons que les opérateurs semi-Fredholm caractérisent les points de continuité de l’application T → γ (π(T)).

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