Spectrum of (n,k)-quasiparanormal operators
Spectrum of (n,k)-quasiparanormal operators
In this work, some spectral properties of (n,k) -quasiparanormal operators are considered.Let T be a (n,k) -quasiparanormal operator, M a nontrivial closed invariant subspace of T and T = T 11 T 12 0 T 22 on M ⊕ M ⊥ .(i) Isolated spectral points and poles.Every nonzero isolated spectral …