W. Fechner

activity

20182022

most citedRichard's inequality, Cauchy-Schwarz's inequality and approximate solutions of Sincov's equation

7 citations · 8 across the 3 of their papers we have counts for

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math.FA2022

Characterizations of derivations on spaces of smooth functions

Włodzimierz Fechner, Aleksandra Świątczak

We provide a list of equivalent conditions under which an additive operator acting on a space of smooth functions on a compact real interval is a multiple of the derivation.

math.FA2020

On the $c_{0}$ -equivalence and permutations of series

Artur Bartoszewicz, Włodzimierz Fechner, Aleksandra Świątczak +1

Assume that a convergent series of real numbers $n = 1 \sum \infty a_{n}$ has the property that there exists a set $A \subseteq N$ such that the series $\sum\limits_{n \in A}…

math.FA2018

Sincov's inequalities on topological spaces

Włodzimierz Fechner

Assume that $X$ is a non-empty set and $T$ and $S$ are real or complex mappings defined on the product $X \times X$ . Additive and multiplicative Sincov's equations are: $$T(x,z) =…

Characterizations of derivations on spaces of smooth functions

On the c0​-equivalence and permutations of series

Sincov's inequalities on topological spaces

On the $c_{0}$ -equivalence and permutations of series