Comfort Types of Ultrafilters

Salvador Garcia-Ferreira
1994 Proceedings of the American Mathematical Society  
Let a be an infinite cardinal. Comfort pre-order on p(a)\a is defined as follows: for p, q G Pia)\a, p ) be the type of p and 7c(p) = {q £ U(q): q and cp = 2
doi:10.2307/2160245 fatcat:smviy553mrhxzn6vlmiksmyylm