Michał Wojciechowski

collaborators

Showing math.FAShow all

3 papers · 1 filter

math.FA2026

Nonexistence of Henkin type projections via a Wiener theorem for multipliers

Eduard Curcă, Michał Wojciechowski

Let $d \geq 2$ , $l \geq 0$ and suppose $X$ is one of the function spaces $W^{l, 1} (T^{d})$ , $W^{l, \infty} (T^{d})$ or $C^{l} (T^{d})$ . We extend a result of…

math.FA2025

Nevanlinna--Pick norms on scattered and Cantor spectra

Przemysław Ohrysko, Michał Wojciechowski

We introduce Nevanlinna--Pick norms associated with finite families of characters on a commutative semisimple Banach algebra $A$ and study the class $N P_{\infty}$ of algebras for whi…

math.FA2025

Factoring the Sobolev embedding operator

Krystian Kazaniecki, Aleksander Pawlewicz, Michał Wojciechowski

The paper studies the factorization and summing properties of the Sobolev embedding operator. We propose two different approaches. One shows that the Sobolev embedding operator $S:…