4 papers · 2 filters
The effects of forcing on exacting and ultraexacting cardinals
Philipp Lücke, Alejandro Poveda
Motivated by recent work of Aguilera--Bagaria--Lücke and Aguilera--Bagaria--Goldberg--Lücke (ABGL), we analyze various effects of set-theoretic forcing upon the classes of exacting…
Compactness phenomena in HOD and the Optimality of Magidor's Covering theorem
Tom Benhamou, James Cummings, Yair Hayut +2
We continue the study of compactness phenomena between the set-theoretic universe and initiated by Goldberg--Poveda \cite{GolPov}. We focus on compactness phenomena…
The number of measures on very large measurable cardinals
Arthur W. Apter, Eyal Kaplan, Alejandro Poveda
We study the possible number of normal measures on a measurable cardinal in settings where inner model techniques are unavailable. Instead, we exploit consequences of the Ultrapowe…
The directedness of the Rudin-Keisler order at measurable cardinals
Yair Hayut, Alejandro Poveda
The manuscript is concerned with the Rudin-Keisler order of ultrafilters on measurable cardinals. The main theorem proved read as follows: Given regular cardinals , the fo…