Timeline for Fundamental group of R^2 minus the (ir)rationals
Current License: CC BY-SA 2.5
9 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Nov 21, 2010 at 14:07 | comment | added | Pete L. Clark | I cast a vote for the question to remain open. | |
| Nov 20, 2010 at 21:38 | answer | added | Jeremy Brazas | timeline score: 9 | |
| Nov 20, 2010 at 21:18 | comment | added | Tim Porter | @Dylan One thought might be to calculate the shape fundamental group using that inverse limit, another would be using a van Kampen theorem -- I have not given up on the fundamental group. The question also reminds me of the calculations of the fundamental group of the Hawaiian earing (I used to know that but cannot be sure of the result now. I think the paper I knew was by H. B. Griffiths.) | |
| Nov 20, 2010 at 21:07 | comment | added | Dylan Wilson | If we enumerate the rationals, this space can be expressed as an inverse limit of spaces we know about. But topological functors seem to behave badly with inverse limits. Can we gain any information from this description of the firsts space? (I'm thinking about homology now; I've given up on the fundamental group.) | |
| Nov 20, 2010 at 20:55 | comment | added | Andreas Thom | I voted to close since it looked a bit like homework. However, the more I think about the question, it seems non-trivial and interesting. Anyhow, I cannot undo by vote but still want this question to stay open. | |
| Nov 20, 2010 at 20:52 | answer | added | Andreas Thom | timeline score: 1 | |
| Nov 20, 2010 at 20:06 | answer | added | André Henriques | timeline score: 6 | |
| Nov 20, 2010 at 20:03 | history | edited | Fedor Petrov | CC BY-SA 2.5 |
added 4 characters in body
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| Nov 20, 2010 at 19:58 | history | asked | fosco | CC BY-SA 2.5 |