2 papers
math.FA2024
Forms of biisometric operators and biorthogonality
B. P. Duggal, C. S. Kubrusly
The paper proves two results involving a pair (A,B) of P-biisometric or (m,P)-biisometric Hilbert-space operators for arbitrary positive integer m and positive operator P. It is sh…
math.FA2024
Weak l-sequential supercyclicity and weak quasistability
C. S. Kubrusly, B. P. Duggal
It is known that supercyclicity implies strong stability. It is not known whether weak l-sequential supercyclicity implies weak stability. In this paper we prove that weak l-sequen…