Mathematics – Logic
Scientific paper
2003-11-05
Mathematics
Logic
Scientific paper
An ultrafilter U is Hausdorff if for any two functions f,g mapping N to N,
f(U)=g(U) iff f(n)=g(n) for n in some X in U. We will show that it is
consistent that there are no Hausdorff ultrafilters.
Bartoszynski Tomek
Shelah Saharon
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