M. Ostermann

activity

20202026

collaborators

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3 papers · 1 filter

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

Hypercyclicity of Toeplitz operators with smooth symbols

Emmanuel Fricain, Sophie Grivaux, Maëva Ostermann

This paper is devoted to the study of the dynamics of Toeplitz operators $T_{F}$ with smooth symbols $F$ on the Hardy spaces of the unit disk $H^{p}$ , $p > 1$ . Building on a model theory…

math.FA2020

An abstract approach to the Crouzeix conjecture

Raphaël Clouâtre, Maëva Ostermann, Thomas Ransford

Let $A$ be a uniform algebra, $θ : A \to M_{n} (C)$ be a continuous homomorphism and $α : A \to A$ be an antilinear contraction such that \[ \|θ(f)+θ(α(f))^*\|\le 2\|f\| \quad(f\in…