3 papers
math.LO2000
On properties of theories which preclude the existence of universal models
Mirna Džamonja, Saharon Shelah
In this paper we investigate some properties of first order theories which prevent them from having universal models under certain cardinal arithmetic assumptions. Our results give…
math.LO2000
Weak reflection at the successor of singular
Mirna Džamonja, Saharon Shelah
The notion of stationary reflection is one of the most important notions of combinatorial set theory. We investigate weak reflection, which is, as the name suggests, a weak version…
math.LO1999
On versions of clubsuit on cardinals larger than aleph_1
Mirna Džamonja, Saharon Shelah
We give two results on guessing unbounded subsets of lambda^+. The first is a positive result and applies to the situation of lambda regular and at least equal to aleph_3, while th…