Relations between the $${mathcal {}}$$-ultrafilters |
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| Authors: | Jianyong Hong Shuguo Zhang |
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| Affiliation: | 1.College of Mathematics,Sichuan University,Chengdu,China |
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| Abstract: | Under CH we show the following results: - (1)
There is a discrete ultrafilter which is not a ({mathcal {Z}}_{0})-ultrafilter. - (2)
There is a (sigma )-compact ultrafilter which is not a ({mathcal {Z}}_{0})-ultrafilter. - (3)
There is a ({mathcal {J}}_{omega ^{3}})-ultrafilter which is not a ({mathcal {Z}}_{0})-ultrafilter.
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