D. Yakubovich

collaborators

3 papers

math.FA2026

Embedding of Toeplitz operators with smooth symbols into strongly continuous semigroups

Emmanuel Fricain, Sophie Grivaux, Maëva Ostermann +1

Using the model theory for Toeplitz operators with smooth symbols developed by the fourth author in the 80's, we study whether such operators $T_{F}$ can be embedded into a $C_{0}$ …

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 $u$ …