Włodzimierz Fechner

collaborators

2 papers

math.CA2023

Operator relations characterizing higher-order differential operators

Włodzimierz Fechner, Eszter Gselmann, Aleksandra Świątczak

Let $r$ be a positive integer, $N$ be a nonnegative integer and $Ω \subset R^{r}$ be a domain. Further, for all multi-indices $α \in N^{r}$ , $∣ α ∣ \leq N$ , let us con…

math.FA2023

Delta-Sincov mappings in Banach algebras

Włodzimierz Fechner, Aleksandra Świątczak

We study solutions and approximate solutions of the multiplicative Sincov equation $T (f, h) = T (f, g) T (g, h)$ for mapping $T$ taking values in a commutative Banach algebra.