Nonmeasurable sets and unions with respect to tree ideals

Marcin Michalski, Robert Rałowski, Szymon Żeberski

In this paper we consider a notion of nonmeasurablity with respect to Marczewski and Marczewski-like tree ideals $s_0$, $m_0$, $l_0$, and $c{l}_0$. We show that there exists a subset…