Prikry-type forcing and the set of possible cofinalities
Prikry-type forcing and the set of possible cofinalities
It is known that the set of possible cofinalities pcf($A$) has good properties if $A$ is a progressive interval of regular cardinals. In this paper, we give an interval of regular cardinals $A$ such that pcf($A$) has no good properties in the presence of a measurable cardinal, or in generic …