Timeline for Pseudo-intersections, splitting families, and ultrafilters
Current License: CC BY-SA 4.0
9 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Feb 17, 2020 at 22:34 | vote | accept | Todd Eisworth | ||
| Feb 17, 2020 at 21:14 | answer | added | Will Brian | timeline score: 7 | |
| Feb 17, 2020 at 19:19 | comment | added | Todd Eisworth | I guess it’s really about reflection dealing with questions like “If every small subfamily has a pseudointersection, does the whole family?” | |
| Feb 17, 2020 at 17:58 | comment | added | Will Brian | I think another good candidate for a counterexample could be the Mathias model. | |
| Feb 17, 2020 at 11:25 | history | edited | Asaf Karagila♦ | CC BY-SA 4.0 |
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| Feb 17, 2020 at 1:11 | comment | added | Todd Eisworth | I don't know the answer to that one. A priori, I don't see why this would need to occur, but I have not thought deeply about it. | |
| Feb 16, 2020 at 23:22 | comment | added | Santi Spadaro | Is it true that $\tau(U)$ is a regular cardinal, for every non-principal ultrafilter $U$ on $\omega$? | |
| Feb 16, 2020 at 21:21 | history | edited | Todd Eisworth | CC BY-SA 4.0 |
added 4 characters in body
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| Feb 16, 2020 at 14:48 | history | asked | Todd Eisworth | CC BY-SA 4.0 |