On the Rudin-Blass Ordering of Measures

Piotr Borodulin-Nadzieja, Arturo Martínez-Celis, Adam Morawski +1

We study the Rudin-Blass (and the Rudin-Keisler) ordering on the finite additive measures on $\omega$. We propose a generalization of the notion of Q-point and selective ultrafilter to…