Timeline for Low dimensional homotopy groups of $\operatorname{Top}(4)$
Current License: CC BY-SA 4.0
7 events
| when toggle format | what | by | license | comment | |
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| Jul 9 at 10:20 | vote | accept | Oleksandr Kharchenko | ||
| Jul 8 at 3:13 | answer | added | skupers | timeline score: 14 | |
| Jul 8 at 1:36 | comment | added | Danny Ruberman | You might like to look at Randall (On 4-dimensional bundle theories. Differential topology, foliations, and group actions (Rio de Janeiro, 1992), 217–233. Contemp. Math., 161, 1994) says that $\pi_3(STOP(4))$ is $\mathbb{Z} \oplus \mathbb{Z} \oplus \mathbb{Z}_2$. In other words, it seems that your exact sequence at the bottom splits. There's some more information in his related publication with Schweitzer (On Foliations, Concordance Spaces, and the Smale Conjectures) in the same volume. | |
| Jul 7 at 18:02 | history | edited | YCor | CC BY-SA 4.0 |
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| Jul 7 at 17:55 | history | edited | Oleksandr Kharchenko |
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| S Jul 7 at 17:51 | review | First questions | |||
| Jul 7 at 18:38 | |||||
| S Jul 7 at 17:51 | history | asked | Oleksandr Kharchenko | CC BY-SA 4.0 |