17 citations · 44 across the 22 of their papers we have counts for
4 papers · 1 filter
On n-quasi left m-invertible operators
B. P. Duggal
A Hilbert space operator $S\in\B$ is -quasi left -invertible (resp., left -invertible) by $T\in\B$, some integers, if (resp., ),…
Isolated eigenvalues, poles and compact perturbations of Banach space operators
B. P. Duggal
Given a Banach space operator , the isolated eigenvalues and the poles (resp., eigenvalues which are isolated points of the approximate point spectrum and…
On Weak Supercyclicity II
C. S. Kubrusly, B. P. Duggal
This paper considers weak supercyclicity for bounded linear operators on a normed space. On the one hand, weak supercyclicity is investigated for classes of Hilbert-space operators…
On Weak Supercyclicity I
C. S. Kubrusly, B. P. Duggal
This paper provides conditions (i) to distinguish weak supercyclicity form supercyclicity for operators acting on normed and Banach spaces, and also (ii) to ensure when weak superc…