Timeline for zeroset-diagonal
Current License: CC BY-SA 3.0
7 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Oct 20, 2011 at 0:57 | vote | accept | Paul | ||
| Oct 19, 2011 at 19:30 | answer | added | KP Hart | timeline score: 2 | |
| Oct 19, 2011 at 5:49 | vote | accept | Paul | ||
| Oct 20, 2011 at 0:57 | |||||
| Oct 18, 2011 at 13:49 | comment | added | Todd Eisworth | I would supplement Joel's statement by also remarking that without any information about motivation, no one can tell if this is a question arising in research, or simply a question arising from a problem set in a topology course. (I'm sensitive to this --- a few years ago, we had a student who posted their problem sets to the 'Ask a topologist' website.) | |
| Oct 18, 2011 at 4:00 | answer | added | David White | timeline score: 3 | |
| Oct 18, 2011 at 1:58 | comment | added | Joel David Hamkins | Your question is interesting, but in order to attract more attentive answers, I would encourage you to edit your question to provide a bit more explanation. For example, a topological space $X$ has a zeroset diagonal when there is a continuous function $f:X\times X\to [0,1]$ with $\Delta=f^{-1}(0)$, where $\Delta=\{(x,x)\mid x\in X\}$ is the diagonal. First countable= every point has a countable local basis. CCC = countable chain condition = every family of disjoint open sets is countable. | |
| Oct 18, 2011 at 1:17 | history | asked | Paul | CC BY-SA 3.0 |