ABSTRACT
In the present chapter we investigate perturbations of noncompact non-normal operators A in a separable Hilbert space H https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9781315156231/ac8cd074-03ee-410d-a782-8a6b4cebe075/content/eq1425.tif"/> . Besides, it is supposed that either A has a Schatten-von Neumann Hermitian component, or A*A−I is a nuclear operator.
