Abstract
On considere des operateurs de Dirac A=∑ j=1 3 α j D j +P(x), P(x)=∑ j=1 N P j (x−a j ), D j =−i∂ j . On demontre que toutes les informations sur le caractere autoadjoint et l'invariance du spectre essentiel sont contenues dans l'inegalite ∥r −1 u∥≤Cμ∥α j D j +P)u∥
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