H. Stanković

collaborators

4 papers

math.FA2026

Spectral Rigidity of Commutators: Dynamics, Resonance, and Nilpotency

Hranislav Stanković

Let $A, T \in M_{n} (C)$ and let $Δ_{A} (T) = A T - T A$ denote the inner derivation induced by $A$ . We determine when $T$ and $Δ_{A} (T)$ are nilpotent under the second-order relati…

math.FA2026

Posinormality and the Root Problem

C. S. Kubrusly, H. M Stankovic

The paper extends three results regarding the nth root problem by embedding classes of Hilbert-space operators into the class of posinormal operators. For instance, it is shown tha…

math.FA2025

On roots of normal operators and extensions of Ando's Theorem

Hranislav Stanković, Carlos Kubrusly

In this paper, we extend Ando's theorem on paranormal operators, which states that if $T \in B (H)$ is a paranormal operator and there exists $ n \in \mathbb{…

math.FA2025

Spherically quasinormal tuples: $n$ -th root problem and hereditary properties

Hranislav Stanković

In this paper, we provide several characterizations of a spherically quasinormal tuple $T$ in terms of its normal extension, as well as in terms of powers of the associate…

Spectral Rigidity of Commutators: Dynamics, Resonance, and Nilpotency

Posinormality and the Root Problem

On roots of normal operators and extensions of Ando's Theorem

Spherically quasinormal tuples: n-th root problem and hereditary properties

Spherically quasinormal tuples: $n$ -th root problem and hereditary properties