We show the relative consistency of N-1 satisfying a combinatorial property
considered by David Fremlin (in the question DU from his list) in certain
choiceless inner models. This is demonstrated by first proving the property
is true for Ramsey cardinals. In contrast, we show that in ZFC, no cardina
l of uncountable cofinality can satisfy a similar, stronger property. The q
uestions considered by D. H. Fremlin are if families of finite subsets of o
mega (1) satisfying a certain density condition necessarily contain all fin
ite subsets of an infinite subset of omega (1), and specifically if this an
d a stronger property hold under MA + -CH. Towards this we show that if MA
+ -CH holds. then for every family. A of N-1 many infinite subsets of omega
(1) one can find a family L of finite subsets of omega (1) which is dense
in Fremlin's sense, and does not contain all finite subsets of any set in A
.
We then pose some open problems related to the question.