학술논문
Stable ordered-union versus selective ultrafilters
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Working Paper
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Abstract
It will be shown to be consistent that there are at least two non-isomorphic selective ultrafilters, but no stable ordered-union ultrafilters. This answers a question of Blass from his 1987 paper which introduced the concept of a stable ordered-union ultrafilter.
Comment: 42 pages. Submitted. Minor revisions made
Comment: 42 pages. Submitted. Minor revisions made