W. Marciszewski

activity

20112021

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math.FA2019

Sailing over three problems of Koszmider

Félix Cabello Sánchez, Jesús M. F. Castillo, Witold Marciszewski +2

We discuss three problems of Koszmider on the structure of the spaces of continuous functions on the Stone compact $K_{A}$ generated by an almost disjoint family $\mathcal…

math.FA2019

Twisted sums of $c_{0}$ and $C (K)$ -spaces: A solution to the CCKY problem

Antonio Avilés, Witold Marciszewski, Grzegorz Plebanek

We consider the class of Banach space $Y$ for which $c_{0}$ admits a nontrivial twisted sum with $Y$ . We present a characterization of such space $Y$ in terms of properties of the $w…

math.FA2015

Extension operators on balls and on spaces of finite sets

Antonio Avilés, Witold Marciszewski

We study extension operators between spaces $σ_{n} (2^{X})$ of subsets of $X$ of cardinality at most $n$ . As an application, we show that if $B_{H}$ is the unit ball of a nonseparable Hil…

math.FA2011

On measures on Rosenthal compacta

Witold Marciszewski, Grzegorz Plebanek

We show that if K is Rosenthal compact which can be represented by functions with countably many discontinuities then every Radon measure on K is countably determined. We also pres…

Sailing over three problems of Koszmider

Twisted sums of c0​ and C(K)-spaces: A solution to the CCKY problem

Extension operators on balls and on spaces of finite sets

On measures on Rosenthal compacta

Twisted sums of $c_{0}$ and $C (K)$ -spaces: A solution to the CCKY problem