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math.FA2023
Weak Stability and Quasistability
C. S. Kubrusly, P. C. M. Vieira
It is known that weak l-sequential supercyclicity implies weak quasistability, and it is still unknown weather weak l-sequential supercyclicity implies weak stability, much less wh…
math.FA2022★ 4 cited
Powers of posinormal operators
C. S. Kubrusly, P. C. M. Vieira, J. Zanni
Square of a posinormal operator is not necessarily posinormal But (i) powers of quasiposinormal operators are quasiposinormal and, under closed ranges assumption, powers of (ii)…
math.FA2020
Boundedly Spaced Subsequences and Weak Dynamics
C. S. Kubrusly, P. C. M. Vieira
The purpose of this paper is to characterize weak supercyclicity for Hilbert-space contractions, which is shown to be equivalent to characterizing weak supercyclicity for unitary o…