Combinatorial dichotomies and cardinal invariants
Combinatorial dichotomies and cardinal invariants
Assuming the P-ideal dichotomy, we attempt to isolate those cardinal characteristics of the continuum that are correlated with two well-known consequences of the proper forcing axiom.We find a cardinal invariant x such that the statement that x > ω 1 is equivalent to the statement that 1, ω, ω 1 …