I. Efraimidis

activity

20242026

collaborators

3 papers

math.CV2026

Harmonic mappings, univalence criteria and a theorem of Lehtinen

Iason Efraimidis, Rodrigo HernÃ¡ndez

The harmonic inner radius $I ¨ _{H} (I^c ◯)$ of a planar domain $I^c ◯$ is the largest constant with which a univalence criterion via the Schwarzian derivative holds for harmonic mappings. We…

math.CV2025

On Hardy spaces, univalent functions and the second coefficient

Martin Chuaqui, Iason Efraimidis, Rodrigo HernÃ¡ndez

We consider normalized univalent functions with prescribed second Taylor coefficient $a_{2}$ . For convex functions $f$ we study the Hardy spaces to which $f$ and $f^{'}$ belong, refinin…

math.CV2024

Hyperbolic convexity of holomorphic level sets

Iason Efraimidis, Pavel Gumenyuk

We prove that the sublevel set ${z \in D : k_{D} (z, z_{0}) - k_{D} (f (z), w_{0}) < I^¼}$ , $I^¼ \in R$ , is geodesically convex with re…