Nikolaos Chalmoukis

activity

20182026

most citedSome Remarks on the Dirichlet Problem on Infinite Trees

6 citations · 34 across the 26 of their papers we have counts for

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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.FA2025

Quaternionic Carleson measures

Nikolaos Chalmoukis, Giulia Sarfatti

In this paper we provide a general construction of a quaternionic Banach space of slice regular functions from a given Banach space of holomorphic functions, which we call its quat…

math.FA2025

Spider's webs and sharp $L^{p}$ bounds for the Hardy--Littlewood maximal operator on Gromov hyperbolic spaces

Nikolaos Chalmoukis, Stefano Meda, Federico Santagati

In this paper we prove that if $1 < a \leq b < a^{2}$ and $X$ is a locally doubling $δ$ -hyperbolic complete connected length metric measure space with $(a, b)$ -pinched exponential growth a…

Operators with small Kreiss constants

Quaternionic Carleson measures

Spider's webs and sharp Lp bounds for the Hardy--Littlewood maximal operator on Gromov hyperbolic spaces

Spider's webs and sharp $L^{p}$ bounds for the Hardy--Littlewood maximal operator on Gromov hyperbolic spaces