D. Yakubovich

activity

20232026

collaborators

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3 papers · 1 filter

math.FA2025

Operators with small Kreiss constants

Nikolaos Chalmoukis, Georgios Tsikalas, Dmitry Yakubovich

We investigate matrices satisfying the Kreiss condition $∥ (z I - T)^{- 1} ∥ \leq \frac{K}{∣ z ∣ - 1}, ∣ z ∣ > 1,$ with $K$ lying arbitrarily close to $1.$ We provide lower bo…

math.CV2025

Self-improving estimates of growth of subharmonic and analytic functions

Glenier Bello, Dmitry Yakubovich

Given a bounded open subset $Ω$ and closed subsets $A, B$ of $R^{k}$ , we discuss when an estimate $u (x) \leq g (d i s t (x, A \cup B))$ , $x \in Ω ∖ (A \cup B)$ , for a function $u$ …

math.FA2025

Resolvent estimates for a function of a linear operator

Glenier Bello, Dmitry Yakubovich

Let $T$ be a bounded linear operator on a Banach space and $f$ an analytic function, defined on the spectrum of $T$ . We study the relations between the rate of growth of the resolv…